US3342348A - Jib arrangements for ships - Google Patents

Jib arrangements for ships Download PDF

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US3342348A
US3342348A US490512A US49051265A US3342348A US 3342348 A US3342348 A US 3342348A US 490512 A US490512 A US 490512A US 49051265 A US49051265 A US 49051265A US 3342348 A US3342348 A US 3342348A
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jib
mast
jibs
ship
pivotal
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US490512A
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Hans E Gjelsteen
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BERGENS MEK VERKSTED
BERGENS MEKANISKE VERKSTEDER AS
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BERGENS MEK VERKSTED
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/60—Derricks
    • B66C23/605—Derricks employing ships' masts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/04—Arrangement of ship-based loading or unloading equipment for cargo or passengers of derricks, i.e. employing ships' masts

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  • pivoting jibs in pairs so as to combine their ability to raise heavy loads with their ability, when coupled, for rapidly loading and unloading lighter loads thereby making as much use as possible of the loading and unloading gear on board for all classes of cargo.
  • a ships jib arrangement comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their respective vertical axes through an angle of at least 180 to form pivotal sectors, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on the longitudinal median line of the ship above one hatch and said sector extending beyond said median line by the other hatch.
  • the sector extends sufiiciently beyond the longitudinal median line that the other outer extremity of the pivotal sector is located adjacent the other hatch but outside the side of the ship.
  • each pivotal sector is disposed on one side of the longitudinal median line with one outer extremity of its pivotal sector disposed on the other side and the other outer extremity located outside the side of the ship on said other side.
  • pivotal sectors be arranged symmetrically in mirror-image relationship relative to the longitudinal median line of the ship, a bisecting line of one sector makng an angle of less than 90 with said median line and a bisecting line for the other sector extending diametrically in the opposite direction relative to the other bisecting line.
  • FIGURE 1 is a schematic cross-ship view of a jib arrangement according to the invention
  • FIGURE 2 is a plan of the jib arrangement according to FIG. 1,
  • FIGURES 3 to 8 are plans of the jib arrangement on a smaller scale than in FIGURE 2 and illustrate difierent applications of the jib arrangement.
  • FIGS. 1 and 2 there is shown a section of a ships hull 10 having ship sides 11 and 12.
  • a structure with associated mast 14 which is disposed between two loading hatches 15 and 16.
  • the bisecting line 24 through the pivotal sector extends through a bevel angle a which in the example illustrated is about relative to the longitudinal median line 21 of the ship.
  • the pivotal sector for the other jib is arranged symmetrically in mirror-image relationship relative to said first jib, and the bisecting line 25 for said pivotal sector extends diametrically opposite to the bisecting line 24.
  • these bisecting lines 24, 25 extend in alignment with the centre line for the two brackets 26, 27 which carry and support the pivoting arrangements 19, 20, so that these pivoting arrangements are also arranged diametrically opposite to one another on the mast.
  • FIGURE 3 illustrates how the loading jibs 17, 18 can be pivoted through arcs 30' and 31 simultaneously between the two hatches 15, 16 on each side of the ship. Such pivoting can occur, for example, in order to transfer cargo from the one loading hatch to the other, or, for example, to transfer deck cargo to and fro on each side of the ship.
  • FIGURE 4 illustrates how the loading jibs 17, 18 can Work on each side of the ship for operating one and the same hatch.
  • the circular arcs 32, 33 drawn in full lines the jibs operation of the hatch 15 is illustrated, with the circular arcs 34, 35 in dotted lines the operation of the hatch 16 is illustrated.
  • FIGURE 5 illustrates by means of pivot arcs 36, 37 how the loading jibs 17, 18 can Work on one and the same side of the ship (for example when it lies at the quay in order to operate their respective hatches 15, 16. correspondingly both jibs can be utilised on the opposite side of the ship (not shown).
  • the loading jibs 17, 18 are illustrated by means of the pivot arcs 38, 39 during work above their respective hatches 15, 16 on each side of the ship. If desired the jib 17 can also be utilised for operating the hatch 16 while the jib 18 can be utilised for operating the hatch 15 (not shown).
  • FIG. 7 the loading jibs 17, 18 are illustrated during employment as coupled jibs, having a common cover hook 40, Where the jibs have a fixed or substantially fixed mounting with an intermediate angle of about 60, so that the one jib 18 is located approximately centrally above the hatch .15 while the other jib 17 is located so that it projects outwardly of the side 11 of the ship. In this way cargo can be raised, transferred and lowered exclusively by means of the loading winches (not shown) of the two jibs and the loading wires 41, 42 in a manner known per se, while the jibs remain in substantially the same position.
  • FIG. 7 only one of four such possible coupled jibs is illustrated, that is to say that FIG. 7 only illustrates the possibility in the one quadrant. By considering the possibilities for the jibs in FIG. 2 it will be evident that there are corresponding possibilities for coupling of the jibs in the three remaining quadrants also.
  • FIGURE 8 illustrates by means of the pivot arcs 43, 44 how the jibs 17, 18 can be mounted in parallel over the hatch 15 and pivoted in parallel outwards in the clockwise direction outside the side of the ship, and they are provided with a common cover hook 45 so as to lift approximately double as heavy a load as the single jib can lift. Correspondingly parallel coupling of the jibs can be obtained on the diametrically opposite side of the mast 14.
  • winches known per se namely cargo winches or topping winges for each jib. These are not illustrated in the drawings, since their location and construction will be well-known to the person skilled in the art.
  • a ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least 180 to form pivotal sectors, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on a longitudinal
  • a ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least 180 to form pivotal sectors, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on a longitudinal
  • a ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least to form pivotal sections, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on a longitudinal median
  • each pivotal sector is disposed on one side of the longitudinal median line with one of the outer extremities of said sector disposed on the other side and the other outer extremity located outside the side of the ship on said other side.
  • a ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least 180 to form pivotal sectors arranged symmetrically in mirror-image relation relative to a longitudinal median line of the ship, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Ship Loading And Unloading (AREA)
  • Package Frames And Binding Bands (AREA)
  • Jib Cranes (AREA)

Description

Sept. 19, 1967 H. E. GJELSTEEN 3,342,348
JIB ARRANGEMENTS FOR SHIPS Filed Sept. 27, 1965 2 Sheets-Sheet 1 INVENTOR: HANS E. GJELSTEE/ MW M Sept. 19, 1967 H. E. GJELSTEEN JIB ARRANGEMENTS FOR SHIPS 2 Sheets-Sheet Filed Sept. 27, 1965 INVENTOB: HAN S E. GJELSTEN United States Patent J (llaims. (Cl. 2123) This invention relates to jib arrangements for ships.
Various methods are available for arranging pivoting jibs in pairs so as to combine their ability to raise heavy loads with their ability, when coupled, for rapidly loading and unloading lighter loads thereby making as much use as possible of the loading and unloading gear on board for all classes of cargo.
It is an object of the invention to provide jib arrangements which are especially versatile, permitting loading and unloading in a large number of ways when the jibs are utilised simultaneously and, if desired, coupled.
According to the present invention a ships jib arrangement comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their respective vertical axes through an angle of at least 180 to form pivotal sectors, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on the longitudinal median line of the ship above one hatch and said sector extending beyond said median line by the other hatch.
Preferably, the sector extends sufiiciently beyond the longitudinal median line that the other outer extremity of the pivotal sector is located adjacent the other hatch but outside the side of the ship.
Conveniently, a main portion of each pivotal sector is disposed on one side of the longitudinal median line with one outer extremity of its pivotal sector disposed on the other side and the other outer extremity located outside the side of the ship on said other side.
It is also preferred that the pivotal sectors be arranged symmetrically in mirror-image relationship relative to the longitudinal median line of the ship, a bisecting line of one sector makng an angle of less than 90 with said median line and a bisecting line for the other sector extending diametrically in the opposite direction relative to the other bisecting line.
In order that the invention can be more clearly understood, a convenient embodiment thereof will now be described, by way of example, with reference to the accompanying drawings in which:
FIGURE 1 is a schematic cross-ship view of a jib arrangement according to the invention,
FIGURE 2 is a plan of the jib arrangement according to FIG. 1,
FIGURES 3 to 8 are plans of the jib arrangement on a smaller scale than in FIGURE 2 and illustrate difierent applications of the jib arrangement.
In FIGS. 1 and 2 there is shown a section of a ships hull 10 having ship sides 11 and 12. At 13 there is located a structure with associated mast 14, which is disposed between two loading hatches 15 and 16. To the mast there are connected two jibs 17, 18, which, in a manner not further illustrated, are mounted for pivoting in a vertical plane and which are adapted to be pivoted in a horizontal plane by means of two pivoting arrangements or rotary motors 19, 20, which are drawn schematically in FIG. 2.
With the type of pivoting arrangements which are em- 3,342,348 Patented Sept. 19, 1967 ployed, purely by way of example, in the embodiment according to the present invention, there can be obtained however a pivotal sector of about 270. It is now proposed according to the invention, that in relation to the longitudinal median line 21 of the ship the vertical projection of the outermost pivot point 22 or outer extremity for the one jibs outer point lies at a position which is disposed on the other side of the longitudinal median line 21 in relation to the side which the main portion of the pivotal sector lies on, while the vertical projection of the other outermost pivot point 23 or outer extremity lies outside the side of the ship on this other side. This is achieved in that the bisecting line 24 through the pivotal sector extends through a bevel angle a which in the example illustrated is about relative to the longitudinal median line 21 of the ship. At the same time the pivotal sector for the other jib is arranged symmetrically in mirror-image relationship relative to said first jib, and the bisecting line 25 for said pivotal sector extends diametrically opposite to the bisecting line 24.
Preferably these bisecting lines 24, 25 extend in alignment with the centre line for the two brackets 26, 27 which carry and support the pivoting arrangements 19, 20, so that these pivoting arrangements are also arranged diametrically opposite to one another on the mast.
With the arrangement of the jibs with associated pivot arrangements it will be possible to allow a jib to operate the one or other hatch as a pivoting jib. In addition it can be used as an auxiliary jib in an arrangement with coupled jibs for the other hatch. How this can be carried out in practice, is illustrated in FIGURES 3 to 8.
FIGURE 3 illustrates how the loading jibs 17, 18 can be pivoted through arcs 30' and 31 simultaneously between the two hatches 15, 16 on each side of the ship. Such pivoting can occur, for example, in order to transfer cargo from the one loading hatch to the other, or, for example, to transfer deck cargo to and fro on each side of the ship.
FIGURE 4 illustrates how the loading jibs 17, 18 can Work on each side of the ship for operating one and the same hatch. By the circular arcs 32, 33 drawn in full lines the jibs operation of the hatch 15 is illustrated, with the circular arcs 34, 35 in dotted lines the operation of the hatch 16 is illustrated.
FIGURE 5 illustrates by means of pivot arcs 36, 37 how the loading jibs 17, 18 can Work on one and the same side of the ship (for example when it lies at the quay in order to operate their respective hatches 15, 16. correspondingly both jibs can be utilised on the opposite side of the ship (not shown).
In FIG. 6 the loading jibs 17, 18 are illustrated by means of the pivot arcs 38, 39 during work above their respective hatches 15, 16 on each side of the ship. If desired the jib 17 can also be utilised for operating the hatch 16 while the jib 18 can be utilised for operating the hatch 15 (not shown).
In FIG. 7 the loading jibs 17, 18 are illustrated during employment as coupled jibs, having a common cover hook 40, Where the jibs have a fixed or substantially fixed mounting with an intermediate angle of about 60, so that the one jib 18 is located approximately centrally above the hatch .15 while the other jib 17 is located so that it projects outwardly of the side 11 of the ship. In this way cargo can be raised, transferred and lowered exclusively by means of the loading winches (not shown) of the two jibs and the loading wires 41, 42 in a manner known per se, while the jibs remain in substantially the same position. In FIG. 7 only one of four such possible coupled jibs is illustrated, that is to say that FIG. 7 only illustrates the possibility in the one quadrant. By considering the possibilities for the jibs in FIG. 2 it will be evident that there are corresponding possibilities for coupling of the jibs in the three remaining quadrants also.
FIGURE 8 illustrates by means of the pivot arcs 43, 44 how the jibs 17, 18 can be mounted in parallel over the hatch 15 and pivoted in parallel outwards in the clockwise direction outside the side of the ship, and they are provided with a common cover hook 45 so as to lift approximately double as heavy a load as the single jib can lift. Correspondingly parallel coupling of the jibs can be obtained on the diametrically opposite side of the mast 14.
When the jibs in this case as mentioned can lift double the Weight relative to what each single jib is designed for, this is due to the vertical pivot axes of the jibs being located so close to each other that no horizontal components of force arise in the system Worth mentioning. Certainly this mode of use will only be able to be used for the foremost hatch when the ship lies with its starboard side to the quay and for the nearmost hatch when the port side lies to the quay, but this is of secondary importance for a piece goods boat.
For the described arrangement there belong winches known per se, namely cargo winches or topping winges for each jib. These are not illustrated in the drawings, since their location and construction will be well-known to the person skilled in the art.
From the above description, it will be appreciated that with a jib arrangement according to the invention, at least as many operating possibilities can be achieved with two loading hatches as prior jib arrangements achieve with a single hatch.
What I claim is:
1. A ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least 180 to form pivotal sectors, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on a longitudinal median line of the ship above one hatch and said sector extending beyond said median line by the other hatch and outside the side of the ship.
2. A ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least 180 to form pivotal sectors, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on a longitudinal median line of the ship above one hatch and said sector extending sufficiently beyond the longitudinal median line that the other outer extremity of the pivotal sector is located adjacent the other hatch outside the side of the ship.
3. A ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least to form pivotal sections, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on a longitudinal median line of the ship above one hatch and said sector extending beyond said median line by the other hatch and outside the side of the ship, a main portion of each pivotal sector being disposed on one side of the longitudinal median line with one of the outer extremities of said sector disposed on the other side and the other outer extremity located outside the side of the ship on said other side.
4. An arrangement according to claim 2, wherein a main portion of each pivotal sector is disposed on one side of the longitudinal median line with one of the outer extremities of said sector disposed on the other side and the other outer extremity located outside the side of the ship on said other side.
5. A ships jib arrangement which comprises two pivoting jibs for operating a pair of hatches disposed longitudinally of the ship on opposite sides of a mast thereof, said jibs being connected to said mast so as to pivot in both vertical and horizontal planes about horizontal and vertical axes respectively, the vertical axes having an eccentric position relative to the axis of the mast and the jibs being adapted to pivot about their said respective vertical axes through an angle of at least 180 to form pivotal sectors arranged symmetrically in mirror-image relation relative to a longitudinal median line of the ship, bracket means having two pivoting arrangements for mounting the lower end of each jib for pivotal movement about horizontal and vertical axes, the pivoting arrangement for one jib being spaced closely to one side and aft of the mast and the pivoting arrangement for the other jib being spaced close to the opposite side and forward of the mast, each pivot axis and the axis of said mast being disposed along a common center line, each jib being mounted so that one of two outer extremities of its pivotal sector lies approximately on said median line above one hatch and said sector extending sufiiciently beyond the longitudinal median line that the other outer extremity of the pivotal sector is located adjacent the other hatch outside the side of the ship, a main portion of each pivotal sector lying on one side of said median line while both its outer extremities are located on the other side, a bisecting line of one sector making an angle of about 60 with said median line and a bisecting line for the other sector extending in a diametrically opposite direction relative to the other bisectin'g line.
References Cited UNITED STATES PATENTS 675,811 6/1901 Burrell 212--3 FOREIGN PATENTS 523 1/ 1896 Great Britain.
ANDRES H. NIELSEN, Primary Examiner.
EVON C. BLUNK, Examiner.

Claims (1)

1. A SHIP''S JIB ARRANGEMENT WHICH COMPRISES TWO PIVOTNG JIBS FOR OPERATING A PAIR OF HATCHES DISPOSED LONGITUDINALLY OF THE SHIP ON OPPOSITE SIDES OF A MAST THEREOF, SAID JIBS BEING CONNECTED TO SAID MAST SO AS TO PIVOT IN BOTH VERTICAL AND HORIZONTAL PLANES ABOUT HORIZONTAL AND VERTICAL AXES RESPECTIVELY THE VERTICAL AXES HAVING AN ECCENTRIC POSITION RELATIVE TO THE AXIS OF THE MAST AND THE JIBS BEING ADAPTED TO PIVOT ABOUT THEIR SAID RESPECTIVE VERTICAL AXES THROUGH AN ANGLE OF AT LEAST 180* TO FORM PIVOTAL SECTORS, BRACKET MEANS HAVING TWO PIVOTING ARRANGEMENTS FOR MOUNTING THE LOWER END OF EACH JIB FOR PIVOTAL MOVEMENT ABOUT HORIZONTAL AND VERTICAL AXES, THE PIVOTING ARRANGEMENT FOR ONE JIB BEING SPACED CLOSELY TO ON SIDE AND AFT OF THE MAST AND THE PIVOTING ARRANGEMENT FOR THE OTHER JIB BEING SPACED CLOSE TO THE OPPOSITE SIDE AND FORWARD OF THE MAST, EACH PIVOT AXIS AND THE AXIS OF SAID MAST BEING DISPOSED ALONG A COMMON CENTER LINE, EACH JIB BEING MOUNTED SO THAT ONE OF TWO OUTER EXTREMITIES OF ITS PIVOTAL SECTOR LIES APPROXIMATELY ON A LONGITUDINAL MEDIAN LINE OF THE SHIP ABOVE ONE HATCH AND SAID SECTOR EXTENDING BEYOND SAID MEDIAN LINE BY THE OTHER HATCH AND OUTSIDE THE SIDE OF THE SHIP.
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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US675811A (en) * 1900-10-01 1901-06-04 Henry Burrell Equipment of electric cranes.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US675811A (en) * 1900-10-01 1901-06-04 Henry Burrell Equipment of electric cranes.

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