CN106245904A - A kind of tool-typed formwork block with adjustable arc thin-wall face - Google Patents
A kind of tool-typed formwork block with adjustable arc thin-wall face Download PDFInfo
- Publication number
- CN106245904A CN106245904A CN201610721966.3A CN201610721966A CN106245904A CN 106245904 A CN106245904 A CN 106245904A CN 201610721966 A CN201610721966 A CN 201610721966A CN 106245904 A CN106245904 A CN 106245904A
- Authority
- CN
- China
- Prior art keywords
- arc thin
- tool
- thin
- arc
- wall panel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009415 formwork Methods 0.000 title claims abstract description 31
- 238000000465 moulding Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000007115 recruitment Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G9/00—Forming or shuttering elements for general use
- E04G9/08—Forming boards or similar elements, which are collapsible, foldable, or able to be rolled up
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
- E04G11/062—Forms for curved walls
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G11/00—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
- E04G11/06—Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for walls, e.g. curved end panels for wall shutterings; filler elements for wall shutterings; shutterings for vertical ducts
- E04G11/062—Forms for curved walls
- E04G11/065—Forms for curved walls with mechanical means to modify the curvature
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The present invention provides a kind of tool-typed formwork block with adjustable arc thin-wall face, belongs to structures surface tool formwork engineering.This tool-typed formwork block includes both sides frame, arc thin-wall panel, some rear support connecting rods and some telescopic support struts.The both sides of described arc thin-wall panel are corresponding with the front side portion of both sides frame respectively to be connected, described some rear support connecting rods are connected laterally at the rear lateral portion of both sides frame respectively, some telescopic support struts are separately positioned between described arc thin-wall panel and rear support connecting rod, to adjust arc thin-wall panel and rear support connecting rod spacing, thus realize the radian to arc thin-wall panel and regulate.The tool-typed formwork block of the present invention can be used for pouring molding arcuate structure face, comprises the arcuate structure face of indent arc and outer convex.The present invention mates use with tool-type support, reaches operation recruitment and saves, and dismounting speed is fast, can repeatedly use, the effect of formwork robust.
Description
Technical field
The present invention relates to building template field of engineering technology, the present invention is that radian adjustable reinforced concrete curved surfaces in surface becomes
Section mould plate, is specifically related to a kind of tool-typed formwork block with adjustable arc thin-wall face.
Background technology
In the various structures of reinforced concrete, should design require typically require structures some spills of surface forming or
The curved surfaces of convex, existing formwork engineering is difficult to meet this condition.In order to meet design requirement, need to design accordingly
Formwork.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art, it is an object of the invention to provide a kind of for molding structures spill or convex
The tool-typed formwork block with adjustable arc thin-wall face on shape surface.
Technical program of the present invention lies in: a kind of tool-typed formwork block with adjustable arc thin-wall face, including dual-side
Frame, arc thin-wall panel, some rear support connecting rods and some telescopic support struts.Wherein arc thin-wall panel be mainly used in
Concrete contacts, in order to the arcs of recesses of molding structures or convex surface, and both sides frame and rear support connecting rod constitute arc thin-wall face
Plate rear support structure, telescopic support struts is for adjusting the arc curvature of arc thin-wall panel.
Both sides frame can be the both sides frame being parallel to each other；Can also be the both sides frame not being parallel to each other, i.e. size
The both sides frame of head extendible.The outer of described both sides frame is provided with the outer plate with support releasable connection.
The both sides of arc thin-wall panel are corresponding with the front side portion of both sides frame respectively to be connected.Specifically, described arc
Slotted hole, the described arc thin-wall panel countersunk head spiral shell through being located on slotted hole is offered in the arranged on left and right sides portion of thin-walled panel
Nail lock is paid on the frame of both sides.Need exist for explanation, being mainly designed to meet at arc thin-wall panel of slotted hole
Arc curvature adjust time, the arranged on left and right sides portion of arc thin-wall panel can suitably adjust position, it is to avoid use be rigidly connected
After cannot adjust its radian.
Some rear support connecting rods are connected laterally at the rear lateral portion of both sides frame respectively, in order to form arc thin-wall panel
Stable rear support structure.Normally, described some rear support connecting rods are equidistant, be evenly distributed in arc thin-wall panel
Rear.
Some telescopic support struts are equidistantly evenly provided between described arc thin-wall panel and rear support connecting rod, with
Just adjust arc thin-wall panel and rear support connecting rod spacing, thus realize the radian to arc thin-wall panel and regulate.
Preferably, the upper and lower end of described arc thin-wall panel has cut some dislocation splicing seams, it is simple to follow-up curved
Folding；The upper and lower end of described arc thin-wall panel turns down formation kink backward.Steady in order to improve the structure of kink further
Qualitative, dislocation splicing seams can be made crack, and make adjacent two sections of upper and lower dislocation lap joints of kink, and be provided with on its clinch
Slotted hole and connecting bolt etc..
In order to improve the mortar leakage prevention ability of the present invention further, the outer of described both sides frame is provided with Leakproof strip.Generally institute
State Leakproof strip to be arranged on the leading flank of outer plate.
In order to improve stability and the bearing capacity of rear support structure further, described rear support connecting rod is the rear support of arc
Connecting rod.The arcuate directions of rear support connecting rod is symmetrical with the arcuate directions of arc thin-wall panel.Specifically, it is assumed that arc is thin
The arcuate directions of Wall board is cambered outwards arcuate directions, then the arcuate directions of rear support connecting rod is also the arc of convex arc
Direction；In like manner, it is assumed that the arcuate directions of arc thin-wall panel is the arcuate directions concaved, then the arcuate directions of rear support connecting rod
Also for the arcuate directions of the arc that concaves.
In order to improve bearing capacity and the curve stable of arc thin-wall panel further, the back side of described arc thin-wall panel
It is provided with some floors equably, the floor that usual described floor uses cross section to be T-shaped or L-type.Described telescopic support struts
One end is hinged on floor, and the other end of described telescopic support struts is hinged on rear support connecting rod.
Telescopic support struts can select the adjustable connector of any one that can bear pressure at two ends.In order to enable further
Understand that the present invention, the present invention give the embodiment of one of which telescopic support struts.Particularly as follows: described telescopic support struts bag
The company's of including rib bar, linking support bar and nut cylinder；The both ends of described nut cylinder are spirally connected with the one end connecting rib bar and linking support bar respectively；Institute
State the outside wall surface of nut cylinder to be provided with on the operating surface for being turned, or described nut cylinder and be provided with for being turned
Handle hole；The other end of described even rib bar is hinged on the floor of arc thin-wall back side of panel, the other end of described linking support bar
Portion is hinged on rear support connecting rod.
It is an advantage of the current invention that: the present invention is surface radian adjustable reinforced concrete curved surfaces forming panel, specifically relates to
And a kind of tool-typed formwork block with adjustable arc thin-wall face.The tool-typed formwork block of the present invention may be installed and its dual-side
In the skeleton that frame is parallel, constitute formwork three-dimensional system, it is achieved the power transmission of template and form cage (support) and fixing.The present invention's
Tool-typed formwork block can be used for pouring molding arcuate structure face, comprises the arcuate structure face of indent arc and outer convex.This
Bright mating use with tool-type support, reach operation recruitment and save, dismounting speed is fast, can repeatedly use, formwork robust
Effect.
Accompanying drawing explanation
Fig. 1 is the backsight structural representation of the tool-typed formwork block in embodiment with adjustable arc thin-wall face.
Fig. 2 is the plan structure schematic diagram of the tool-typed formwork block in embodiment with adjustable arc thin-wall face.
Fig. 3 is the structural representation in Fig. 1 along A A sight line section view.
Fig. 4 is the close-up schematic view in Fig. 3 at I.
Fig. 5 is the close-up schematic view in Fig. 3 at II.
Fig. 6 is the section structure schematic diagram of B B in Fig. 1.
Fig. 7 is the structural representation that frame is connected with template framework.
In figure: 1 frame, 2 arc thin-wall panels, 3 rear support connecting rods, 4 telescopic support struts, 5 sunk screws,
6 Leakproof strips, 7 floors, 8 template frameworks, 9 back support rods；
1.1 outer plates, 2.1 kinks, 2.2 slotted holes and connecting bolt, 4.1 company's rib bars, 4.2 linking support bars,
4.3 nut cylinders.
Detailed description of the invention
In order to technical scheme and technique effect can be become apparent, below and coordinate accompanying drawing, make specifically
Bright.
As shown in Figures 1 to 6, there is during Fig. 1 is embodiment the backsight knot of the tool-typed formwork block of adjustable arc thin-wall face
Structure schematic diagram.Fig. 1 uses the technique of painting partly cutd open, and eliminates parts thereof.Fig. 2 is to have adjustable arc thin-wall face in embodiment
The plan structure schematic diagram of tool-typed formwork block.Fig. 2 eliminates parts thereof.Fig. 3 is along A A sight line section view in Fig. 1
Structural representation.In Fig. 3, part telescopic support struts uses the simple technique of painting to illustrate.
The tool-typed formwork block with adjustable arc thin-wall face of the present invention include both sides frame 1, arc thin-wall panel 2,
Some rear support connecting rods 3 and some telescopic support struts 4.Wherein the arc of arc thin-wall panel 2 can be Inner arc, it is possible to
To be external arc.Arc thin-wall panel 2 is mainly used in contacting with concrete, in order to the arcs of recesses of molding structures or convex surface,
Both sides frame 1 and rear support connecting rod 3 constitute arc thin-wall panel rear support structure, and telescopic support struts 4 is used for adjusting arc thin-wall
The arc curvature of panel.
As shown in Figure 1, Figure 2 and Figure 3, both sides frame 1 can be the both sides frame being parallel to each other；Can also be the most mutually to put down
The both sides frame of row, i.e. the both sides frame of concentric reducer extendible.The outer of described both sides frame is provided with and support releasable connection
Outer plate 1.1.In the present embodiment, drawing explanation as a example by the both sides frame being parallel to each other is used.
Connect as it is shown in figure 1, the both sides of arc thin-wall panel are corresponding with the front side portion of both sides frame respectively.Specifically
Saying, the arranged on left and right sides portion of described arc thin-wall panel offers slotted hole, and described arc thin-wall panel is through being located in slotted hole
On sunk screw 5 lock pay on the frame of both sides.Need exist for explanation, being mainly designed to meet at arc of slotted hole
When the arc curvature of shape thin-walled panel adjusts, the arranged on left and right sides portion of arc thin-wall panel can suitably adjust position, it is to avoid just
Property connect after cannot adjust its radian.
As in figure 2 it is shown, in the present embodiment, the upper and lower end of described arc thin-wall panel 2 has cut some dislocation and has spelled
Seam, it is simple to follow-up bending；The upper and lower end of described arc thin-wall panel turns down formation kink 2.1 backward.Work as arc thin-wall
When the arc curvature of panel is bigger, in order to improve the structural stability of kink further, can dislocation splicing seams be made little
Seam, and make adjacent two sections of upper and lower dislocation lap joints of kink, and on its clinch, it is provided with slotted hole and connecting bolt 2.2 etc..When
When the arc curvature of arc thin-wall panel is smaller, two sections of adjacent kinks cannot dislocation lap joint, can wherein one section curved
Welding an accessory plate on folding part, described accessory plate extends horizontally to the surface of wherein another section of kink, and at accessory plate and
Wherein it is correspondingly arranged slotted hole and connecting bolt 2.2 etc. on another section of kink, thus realizes the work between adjacent two kinks
It is dynamically connected.
As shown in Figures 2 and 3, some rear support connecting rods 3 are connected laterally at the rear lateral portion of both sides frame 1 respectively, in order to
Form the stable rear support structure of arc thin-wall panel 2.Normally, described some rear support connecting rods are equidistantly, equably
It is distributed in the rear of arc thin-wall panel.
As it is shown on figure 3, some telescopic support struts 4 are equidistantly evenly provided on described arc thin-wall panel 2 and rear
Between supporting rod 3, in order to adjust arc thin-wall panel 2 and rear support connecting rod 3 spacing, thus realize arc thin-wall panel 2
Radian regulates.
As it is shown on figure 3, for the mortar leakage prevention ability improving the present invention further, the outer of described both sides frame is provided with leakproof
Bar 6.Usual described Leakproof strip is arranged on the leading flank of outer plate 1.1 of both sides frame.
In order to improve stability and the bearing capacity of rear support structure further, described rear support connecting rod 3 is rear of arc
Supporting rod.The arcuate directions of rear support connecting rod 3 is symmetrical with the arcuate directions of arc thin-wall panel 2.Specifically, it is assumed that arc
The arcuate directions of shape thin-walled panel is cambered outwards arcuate directions, then the arcuate directions of rear support connecting rod is also convex arc
Arcuate directions；In like manner, it is assumed that the arcuate directions of arc thin-wall panel is the arcuate directions concaved, then the arc of rear support connecting rod
Direction is also for the arcuate directions of the arc that concaves.In the present embodiment, explanation of drawing as a example by the arcuate directions of convex arc,
The most as shown in Figures 2 and 3.
In order to improve bearing capacity and the curve stable of arc thin-wall panel further, the back side of described arc thin-wall panel
Being provided with some floors 7 equably, the floor that usual described floor uses cross section to be T-shaped or L-type, in the present embodiment with T
Draw as a example by shape floor and illustrate, the most as shown in Figure 5.One end of described telescopic support struts is hinged on floor 7, described scalable
The other end of pole is hinged on rear support connecting rod 3.
In the present embodiment, described telescopic support struts 4 includes even rib bar 4.1, linking support bar 4.2 and nut cylinder 4.3；Described spiral shell
Be provided with oppositely oriented female thread in master cylinder, the both ends of described nut cylinder respectively with even rib bar and the one end spiral shell of linking support bar
Connect；The outside wall surface of described nut cylinder is provided with the operating surface for being turned, such as hexagon outer nut face.At the present embodiment
In, described nut cylinder is provided with the handle hole 4.4 for being turned, just can be revolved by action bars update hole 4.4
Dynamic nut cylinder.The other end of described even rib bar 4.1 is hinged on the floor 7 of arc thin-wall back side of panel, described linking support bar 4.2
The other end is hinged on rear support connecting rod 3.
During use, adjusted the radian of arc thin-wall panel by telescopic support struts 4 after, then by releasable connection part by two
Outer plate 1.1 lock of side frame 1 is paid on template framework 8 or support, or is pressed in rear on outer plate 1.1 back side by top
Strut secures it within template framework 8 or support.The tool-typed formwork block of the present invention mates use, instrument with tool-type support
The arc thin-wall panel of formula formwork and the template framework of tool-type support collectively form and complete pour face, accomplish operation recruitment
The effects such as saving, speed is fast, dismounts freely, reusable.
The foregoing is only presently preferred embodiments of the present invention, all impartial changes done according to scope of the present invention patent with
Modify, all should belong to the covering scope of the present invention.
Claims (7)
1. there is a tool-typed formwork block for adjustable arc thin-wall face, including both sides frame, arc thin-wall panel, after some
Support link and some telescopic support struts, it is characterised in that: the both sides of described arc thin-wall panel respectively with both sides frame
Front side portion correspondence connect, described some rear support connecting rods are connected laterally at the rear lateral portion of both sides frame respectively, and some can
Telescopic strut is separately positioned between described arc thin-wall panel and rear support connecting rod, in order to adjustment arc thin-wall panel and rear
Supporting rod spacing, thus realize the radian to arc thin-wall panel and regulate.
The tool-typed formwork block with adjustable arc thin-wall face the most according to claim 1, it is characterised in that: described both sides
The outer of frame is provided with the outer plate with support releasable connection.
The tool-typed formwork block with adjustable arc thin-wall face the most according to claim 1, it is characterised in that: described both sides
The outer of frame is provided with Leakproof strip.
The tool-typed formwork block with adjustable arc thin-wall face the most according to claim 1, it is characterised in that: prop up after described
Supporting rod is the rear support connecting rod of arc.
The tool-typed formwork block with adjustable arc thin-wall face the most according to claim 1, it is characterised in that: described arc
The back side of thin-walled panel is evenly arranged with some floors, and one end of described telescopic support struts is hinged on floor, described stretches
The other end of contracting pole is hinged on rear support connecting rod.
The most according to claim 1 or 5, there is the tool-typed formwork block of adjustable arc thin-wall face, it is characterised in that: described
Telescopic support struts includes even rib bar, linking support bar and nut cylinder；The both ends of described nut cylinder respectively with even rib bar and linking support bar
One end is spirally connected；The outside wall surface of described nut cylinder is provided with on the operating surface for being turned, or described nut cylinder setting
There is the handle hole for being turned；The other end of described even rib bar is hinged on the floor of arc thin-wall back side of panel, described
The other end of linking support bar is hinged on rear support connecting rod.
The tool-typed formwork block with adjustable arc thin-wall face the most according to claim 1, it is characterised in that: described arc
The upper and lower end of thin-walled panel has cut some dislocation splicing seams, and the upper and lower end of described arc thin-wall panel turns down backward
Form kink.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610721966.3A CN106245904B (en) | 2016-08-25 | 2016-08-25 | A kind of tool-typed formwork block with adjustable arc thin-wall face |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610721966.3A CN106245904B (en) | 2016-08-25 | 2016-08-25 | A kind of tool-typed formwork block with adjustable arc thin-wall face |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106245904A true CN106245904A (en) | 2016-12-21 |
| CN106245904B CN106245904B (en) | 2018-09-11 |
Family
ID=57595803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610721966.3A Expired - Fee Related CN106245904B (en) | 2016-08-25 | 2016-08-25 | A kind of tool-typed formwork block with adjustable arc thin-wall face |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106245904B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110815384A (en) * | 2019-11-16 | 2020-02-21 | 湖南利德森医疗器械有限公司 | Mask perforating device for anesthesia and respiration |
| CN110883267A (en) * | 2019-12-23 | 2020-03-17 | 中国人民解放军63926部队 | Circular stirrup processingequipment |
| CN112211396A (en) * | 2020-10-10 | 2021-01-12 | 广东省构建工程建设有限公司 | Aluminum mold with conveniently-disassembled and assembled small-space structure and construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2704260A1 (en) * | 1993-04-21 | 1994-10-28 | Ricard Coffrages | Method for curving shuttering (formwork) and curvable shuttering making use of this method |
| US6012699A (en) * | 1997-07-21 | 2000-01-11 | Wu; Edward | Concrete form having adjustable curvature |
| CN2837438Y (en) * | 2005-07-07 | 2006-11-15 | 北京市建筑工程研究院 | Curvature-adjustable full-steel arc clear water concrete framework |
| CN102191856A (en) * | 2010-03-18 | 2011-09-21 | 彭宝安 | Curved surface template with adjustable curvature |
| CN203559579U (en) * | 2013-08-27 | 2014-04-23 | 中交路桥华南工程有限公司 | Integral type curvature-adjustable curved-surface template |
-
2016
- 2016-08-25 CN CN201610721966.3A patent/CN106245904B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2704260A1 (en) * | 1993-04-21 | 1994-10-28 | Ricard Coffrages | Method for curving shuttering (formwork) and curvable shuttering making use of this method |
| US6012699A (en) * | 1997-07-21 | 2000-01-11 | Wu; Edward | Concrete form having adjustable curvature |
| CN2837438Y (en) * | 2005-07-07 | 2006-11-15 | 北京市建筑工程研究院 | Curvature-adjustable full-steel arc clear water concrete framework |
| CN102191856A (en) * | 2010-03-18 | 2011-09-21 | 彭宝安 | Curved surface template with adjustable curvature |
| CN203559579U (en) * | 2013-08-27 | 2014-04-23 | 中交路桥华南工程有限公司 | Integral type curvature-adjustable curved-surface template |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110815384A (en) * | 2019-11-16 | 2020-02-21 | 湖南利德森医疗器械有限公司 | Mask perforating device for anesthesia and respiration |
| CN110883267A (en) * | 2019-12-23 | 2020-03-17 | 中国人民解放军63926部队 | Circular stirrup processingequipment |
| CN112211396A (en) * | 2020-10-10 | 2021-01-12 | 广东省构建工程建设有限公司 | Aluminum mold with conveniently-disassembled and assembled small-space structure and construction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106245904B (en) | 2018-09-11 |
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Effective date of registration: 20210202 Address after: 350000 the fourth office on the southeast side of the comprehensive seventh floor of the city construction building, 315 Fuxin Road, Shuibu street, Gulou District, Fuzhou City, Fujian Province Patentee after: Fuzhou Gulou Wenying Construction Engineering Co.,Ltd. Address before: 350011 Fuxin intersection, north section of Liuyi Road, Gulou District, Fuzhou City, Fujian Province Patentee before: FUJIAN THIRD CONSTRUCTION ENGINEERING Co.,Ltd. |
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Granted publication date: 20180911 |
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| CF01 | Termination of patent right due to non-payment of annual fee |