US1968616A - Golf club shaft - Google Patents
Golf club shaft Download PDFInfo
- Publication number
- US1968616A US1968616A US584172A US58417231A US1968616A US 1968616 A US1968616 A US 1968616A US 584172 A US584172 A US 584172A US 58417231 A US58417231 A US 58417231A US 1968616 A US1968616 A US 1968616A
- Authority
- US
- United States
- Prior art keywords
- shaft
- golf club
- club shaft
- section
- sections
- 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.)
- Expired - Lifetime
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Classifications
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B53/00—Golf clubs
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/0085—Telescopic shafts
-
- A—HUMAN NECESSITIES
- A63—SPORTS; GAMES; AMUSEMENTS
- A63B—APPARATUS FOR PHYSICAL TRAINING, GYMNASTICS, SWIMMING, CLIMBING, OR FENCING; BALL GAMES; TRAINING EQUIPMENT
- A63B60/00—Details or accessories of golf clubs, bats, rackets or the like
- A63B60/54—Details or accessories of golf clubs, bats, rackets or the like with means for damping vibrations
Definitions
- This invention relates to golf clubs and more ⁇ particularly to a shaft construction forA such clubs.
- One of the objects of the present invention is the provision of a golf club shaft which 5 will possess a maximum of iiexibility, strength,
- agolf ball is'struck, it is compressed or flattened slightly due to its resiliency, which compression results ⁇ in a corneback or kickback against theY club head, and it isthis action that promotes length ⁇ of flight, rather than the force of the blow.
- my improved golf club shaft With my improved golf club shaft, the desiredflexibility is secured and at the same time, the clubshaft possesses the necessary rigidity to permit the club to carry through and give maximum flight to the ball.
- the invention contemplates the employment of a golf club shaft Vwhich ⁇ is decreased in diameter toward its opposite ends, so thatfthe vibration imparted tothe club incident to striking the ball, will be gradually dampened out by the form of its shaft rather than imparted to the hands of the user.
- Another object of this invention is to provide a golf club shaft which is built up of a plurality of tubular sections whose ends are joined together with interposed tubular parts formed of rubber or other suitable yieldable material vulcanized in place and which permits of slight relative lateral movement of the sections, thereby absorbing or dampening out the vibrations or shock incident to hitting the ball.
- Figure 1 is a side elevation of a golf club illustrative of an embodiment of the present invention
- Fig. 2 is an enlarged detail view, partly in elevation and partly in section of a club shaft, the hand grip at the upper end thereof being shown in dot and dash lines;
- Fig. 3 is a modied embodiment of the invention, showing a shaft partly in section and partly in elevation;
- Fig. 4 is an enlarged sectional detail substan* tially upon the line 4-4 of Fig. 3; Y
- Fig. ⁇ 5 is a similar section upon the line 5-5 of Fig. 3;
- Fig. 6 is a transverse section upon line 6 6 of Fig. 3;
- Fig. 8 is a ⁇ longitudinal sectional detail'showing a further modiiicationof the invention.
- Fig. 9 is asimilar sectional view of a further modification of the construction.
- a lower tubular metal section 5 gradually increasing in diameter from its lower end and Vcarrying a conventional head 6 is provided.
- the. lowerr section or shaft 5 extends for a distance into the lower end of and is inclosed by asuitable hand grip '7.
- an upper tubular section 8 which decreases in diameter toward its upper end and has its lower end 9 received within the upper end of the section 5.
- a tubular tapered cushioning sheath l0 is interposed between the outer surface of the lower end portion 9 of the section 8 and the inner surface of the upper end of the 4section 5.
- this cushioning elementfl isin the form of a rubber tube which is vulcanized directly to opposed surfaces of the adjacent ends of the two sections and thus firmly secures these sections together.
- a plug l1 is received in they upper end of the section 8 and secured thereto by a suitable fastening 12, is the cap 13 of the hand grip 7.
- the upper section 8 is spaced throughout its length from the hand grip 'l so that none of the vibrations from the club head will be transmitted to the hand grip. Moreover, the vibrations set up by the impact of the club head against a ball, will travel longitudinally through the club shaft and be gradually dampcned out at the smaller end of the upper section 8.
- the club shaft is built up of a plurality of telescopically engaged sections 11i oi varying diameters.
- a tubular cushioning element 15 of rubber or other resilient material is interposed between the telesccped ends and being vulcanized thereto, secures the sections together against endwise displacement.
- the lower or bottom section 5a projects into the lower end of the upper section 8a, the latter gradually decreasing in diameter from its lower end upwardly and within the upwardly tapering space between these telescoped ends, is a tubular connecting member 15a which is similarly tapered in thickness to t within and fill this space, being vulcanized to the tube ends to hold them against endwise separation,
- the ball With a golf club having a shaft such as described, the ball will be given maximum flight by reason of the iiexibility of this shaft which permits the club head end of this shaft to yield away from the ball and then spring back against the ball so that the club head will be kept in constant contact with theV ball and follow through, thereby producing maximum flight.
- a golf club shaft including a pair of sections having telescoping adjacent end portions with one of said portions tapered longitudinally and with the free end of one portion of a diameter to bear upon the surface of the other portion opposed thereto, to provide a longitudinally tapered space between said portions, and a member formed of Vresilient material within said space.
- a golf club shaft including a pair of sections having telescoping adjacent end portions, the free end of one end portion bearing upon the other portion with a space between the remainder thereof and the said other portion, and a resilient ller member within said space to provide for lateral deflection of one section relative to the other about said bearing.
- a golf club shaft including a pair of tubular members having telescoped adjacent end portions, said portions being tapered longitudinally with the free end of one portion bearing upon the opposed surface of the other portion and forming a longitudinally tapered space between said portions, and a sleeve of resilient material lling said space.
- a golf club shaft including a pair of members having their adjacent ends telescoped, one within the other, said outer of said telescoped end portions being of increasing diameter toward the free end thereof and of an internal diameter inwardly from said free end equal to or less than the external diameter of the extreme inner ⁇ end of the inner of said telescoped end portions, whereby the inner end of the inner portion bears upon the inner surface of the outer portion and a space of substantial width in cross section is provided between said inner portion at a distance from its free end and the free end of said outer portion; and a sleeve of resilient material within said space between said telescoped end portions.
- a golf club shaft comprising members having their adjacent ends telescoped, one within the other, each of said portions being tapered longitudinally throughout its length, the lower of said members forming the main part of the shaft and tapering downwardly to the head on the lower end of said shaft, said upper member being tapered upwardly and forming the handle end portion of the shaft, said upper member being of an external diameter at its lower end to fit the internal diameter of the lower member inwardly from its upper end, with a space between said interengaged end portions of said members which space is tapered longitudinally, a filling of resilient material within said space, and a handle sleeved upon the upper member of the shaft and secured to the reduced upper end of' said shaft member with the lower end of said handle enclosing said sleeve joint between said upper and lower shaft members.
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physical Education & Sports Medicine (AREA)
- Golf Clubs (AREA)
Description
.IfMoLDHAM GOLF CLUB SHAFT' July 3l, 1934.
Filed Dec. 51. 1951 llllllnlllllllllilaoallfnlns. vwdwlvaulwlvlvlvrilfvnvlvf` t n .nvlllllnnnultlllllllinfilllffldlllllevrlnvffllllngrlvll..
llilivlllli ffllflllllwrvwwrlnlnflllllllllrllnllilalilla INVENTOR Patented July 31, 1934 "1368,616 GOLF CLUB SHAFT .fJoim M. o1aham,.netro`it, Mich., assigner to `Leonard A. Young,` Detroit, Mich.
i Application Decemberl, `1931, Serial No. 584,172
` c1aims. (c1. 27s-so) Y This invention relates to golf clubs and more `particularly to a shaft construction forA such clubs. One of the objects of the present invention is the provision of a golf club shaft which 5 will possess a maximum of iiexibility, strength,
and durability. i
It is well known that when agolf ball is'struck, it is compressed or flattened slightly due to its resiliency, which compression results` in a corneback or kickback against theY club head, and it isthis action that promotes length `of flight, rather than the force of the blow. With my improved golf club shaft, the desiredflexibility is secured and at the same time, the clubshaft possesses the necessary rigidity to permit the club to carry through and give maximum flight to the ball.` f i More specifically, the invention contemplates the employment of a golf club shaft Vwhich `is decreased in diameter toward its opposite ends, so thatfthe vibration imparted tothe club incident to striking the ball, will be gradually dampened out by the form of its shaft rather than imparted to the hands of the user.
Another object of this invention is to provide a golf club shaft which is built up of a plurality of tubular sections whose ends are joined together with interposed tubular parts formed of rubber or other suitable yieldable material vulcanized in place and which permits of slight relative lateral movement of the sections, thereby absorbing or dampening out the vibrations or shock incident to hitting the ball.
With the above and other ends in view, the invention resides in the matters hereinafter set forth and more particularly pointed out in thel appended claims, reference being had to the accompanying drawing in which:
Figure 1 is a side elevation of a golf club illustrative of an embodiment of the present invention;
Fig. 2 is an enlarged detail view, partly in elevation and partly in section of a club shaft, the hand grip at the upper end thereof being shown in dot and dash lines;
Fig. 3 is a modied embodiment of the invention, showing a shaft partly in section and partly in elevation;
Fig. 4 is an enlarged sectional detail substan* tially upon the line 4-4 of Fig. 3; Y
Fig.` 5 is a similar section upon the line 5-5 of Fig. 3;
Fig. 6 is a transverse section upon line 6 6 of Fig. 3;
4 Fig. '7 a similar section upon lineV 7-7 `olf Fig'. 3;
Fig. 8 is a` longitudinal sectional detail'showing a further modiiicationof the invention; and
Fig. 9 is asimilar sectional view of a further modification of the construction.
Referring to the invention in detail andV particularly to Figs. l to '7, inclusive, a lower tubular metal section 5 gradually increasing in diameter from its lower end and Vcarrying a conventional head 6 is provided. As shown particularly in Fig. `1 the. lowerr section or shaft 5 extends for a distance into the lower end of and is inclosed by asuitable hand grip '7.
Housed within this hand grip Tis an upper tubular section 8 which decreases in diameter toward its upper end and has its lower end 9 received within the upper end of the section 5. In order to provide iiexibility or slight relative lat; eral movement of the two sections where they join each` other, a tubular tapered cushioning sheath l0 is interposed between the outer surface of the lower end portion 9 of the section 8 and the inner surface of the upper end of the 4section 5. Preferably this cushioning elementfl isin the form of a rubber tube which is vulcanized directly to opposed surfaces of the adjacent ends of the two sections and thus firmly secures these sections together.
A plug l1 is received in they upper end of the section 8 and secured thereto by a suitable fastening 12, is the cap 13 of the hand grip 7.
VAs shown in Fig. 2 the upper section 8 is spaced throughout its length from the hand grip 'l so that none of the vibrations from the club head will be transmitted to the hand grip. Moreover, the vibrations set up by the impact of the club head against a ball, will travel longitudinally through the club shaft and be gradually dampcned out at the smaller end of the upper section 8.
In the embodiment of the invention disclosed in Figs. 3 to 7, the same results are attained but the club shaft is built up of a plurality of telescopically engaged sections 11i oi varying diameters.
At the joints where the sections are telescopically joined, a tubular cushioning element 15 of rubber or other resilient material is interposed between the telesccped ends and being vulcanized thereto, secures the sections together against endwise displacement.
In the construction shown in Fig. 9 the lower or bottom section 5a projects into the lower end of the upper section 8a, the latter gradually decreasing in diameter from its lower end upwardly and within the upwardly tapering space between these telescoped ends, is a tubular connecting member 15a which is similarly tapered in thickness to t within and fill this space, being vulcanized to the tube ends to hold them against endwise separation,
With a golf club having a shaft such as described, the ball will be given maximum flight by reason of the iiexibility of this shaft which permits the club head end of this shaft to yield away from the ball and then spring back against the ball so that the club head will be kept in constant contact with theV ball and follow through, thereby producing maximum flight.
It will also be observed that the vibrations set up when the club head comes into contact with the ball, and travelling longitudinally through the sections, will be gradually dampened out by the tapered formation of the sections, and the yieldable members connecting their telescoped ends, instead of being transmitted to the hands of the player. In addition these yieldable connecting members between the sections which serve to join their telescoped ends, permit a slight relative lateral or yieldablel movement between the sections which renders the club shaft eX- tremely flexible, and yet sufficiently stii tol follow through after the ball. This flexibility is an aid to the feel of the club in the hands of the player and is of material assistance to him in acquiring a free rhythmical swing.
What I claim is:
1. A golf club shaft including a pair of sections having telescoping adjacent end portions with one of said portions tapered longitudinally and with the free end of one portion of a diameter to bear upon the surface of the other portion opposed thereto, to provide a longitudinally tapered space between said portions, and a member formed of Vresilient material within said space.
2. A golf club shaft including a pair of sections having telescoping adjacent end portions, the free end of one end portion bearing upon the other portion with a space between the remainder thereof and the said other portion, and a resilient ller member within said space to provide for lateral deflection of one section relative to the other about said bearing.
3. A golf club shaft including a pair of tubular members having telescoped adjacent end portions, said portions being tapered longitudinally with the free end of one portion bearing upon the opposed surface of the other portion and forming a longitudinally tapered space between said portions, and a sleeve of resilient material lling said space.
4. A golf club shaft including a pair of members having their adjacent ends telescoped, one within the other, said outer of said telescoped end portions being of increasing diameter toward the free end thereof and of an internal diameter inwardly from said free end equal to or less than the external diameter of the extreme inner` end of the inner of said telescoped end portions, whereby the inner end of the inner portion bears upon the inner surface of the outer portion and a space of substantial width in cross section is provided between said inner portion at a distance from its free end and the free end of said outer portion; and a sleeve of resilient material within said space between said telescoped end portions.
5. A golf club shaft comprising members having their adjacent ends telescoped, one within the other, each of said portions being tapered longitudinally throughout its length, the lower of said members forming the main part of the shaft and tapering downwardly to the head on the lower end of said shaft, said upper member being tapered upwardly and forming the handle end portion of the shaft, said upper member being of an external diameter at its lower end to fit the internal diameter of the lower member inwardly from its upper end, with a space between said interengaged end portions of said members which space is tapered longitudinally, a filling of resilient material within said space, and a handle sleeved upon the upper member of the shaft and secured to the reduced upper end of' said shaft member with the lower end of said handle enclosing said sleeve joint between said upper and lower shaft members.
JOHN M. OLDHAM.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US584172A US1968616A (en) | 1931-12-31 | 1931-12-31 | Golf club shaft |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US584172A US1968616A (en) | 1931-12-31 | 1931-12-31 | Golf club shaft |
Publications (1)
Publication Number | Publication Date |
---|---|
US1968616A true US1968616A (en) | 1934-07-31 |
Family
ID=24336188
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US584172A Expired - Lifetime US1968616A (en) | 1931-12-31 | 1931-12-31 | Golf club shaft |
Country Status (1)
Country | Link |
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US (1) | US1968616A (en) |
Cited By (27)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4046413A (en) * | 1976-09-14 | 1977-09-06 | Atlantic Products Corporation | Golf ball retriever |
US4330126A (en) * | 1979-08-30 | 1982-05-18 | Brunswick Corporation | High flex golf shaft having reverse tapered butt section |
FR2580506A1 (en) * | 1985-04-19 | 1986-10-24 | Viellard Paul Henri | Method for manufacturing golf clubs obtained by hooping composite metal materials enabling their mechanical and metrological properties to be controlled |
WO1986006286A1 (en) * | 1985-04-19 | 1986-11-06 | Viellard Paul Henri | Golf clubs and method for their fabrication |
FR2581887A1 (en) * | 1985-05-15 | 1986-11-21 | Viellard Paul Henri | Method for manufacturing golf clubs and set of tubes intended to produce clubs obtained by the method |
US4696468A (en) * | 1982-07-20 | 1987-09-29 | Dube Brian J | Juggling club |
US5054781A (en) * | 1990-05-10 | 1991-10-08 | Soong Tsai C | Sports equipment with enhanced flexibility |
US5080363A (en) * | 1990-05-10 | 1992-01-14 | Soong Tsai C | Sports equipment with enhanced flexibility |
US5253867A (en) * | 1989-09-27 | 1993-10-19 | Gafner Donald M | Multi-component shaft for golf clubs |
US5294119A (en) * | 1991-09-27 | 1994-03-15 | Taylor Made Golf Company, Inc. | Vibration-damping device for a golf club |
US5655975A (en) * | 1995-06-07 | 1997-08-12 | Roush Anatrol, Inc. | Golf club having vibration damping device and method for making same |
US5674134A (en) * | 1995-10-03 | 1997-10-07 | Blankenship; William A. | Golf club shaft extender |
US5904627A (en) * | 1996-05-01 | 1999-05-18 | Kasco Corporation | Golf club shaft |
US5935027A (en) * | 1995-12-28 | 1999-08-10 | Roush Anatrol, Inc. | Multi-mode vibration absorbing device for implements |
US6196930B1 (en) * | 1997-11-12 | 2001-03-06 | Randy T. Aumock | Extension apparatus for golf club |
US6203447B1 (en) | 1999-12-07 | 2001-03-20 | True Temper Sports, Inc. | Bonding apparatus for modular shafts |
US6231456B1 (en) | 1999-04-05 | 2001-05-15 | Graham Rennie | Golf shaft vibration damper |
US6343999B1 (en) | 1999-09-20 | 2002-02-05 | Adams Golf Ip Lp | Set of golf club shafts |
US20040229709A1 (en) * | 2003-05-16 | 2004-11-18 | Soren Solari | Golf putter construction |
USRE38983E1 (en) | 1995-06-13 | 2006-02-14 | Adams Golf Ip, Lp | Golf club shaft and insert therefor |
US20080032812A1 (en) * | 2006-08-04 | 2008-02-07 | Sorenson James W | Weighted golf club |
US20080153620A1 (en) * | 2006-12-22 | 2008-06-26 | David Hueber | Golf club with flexible grip portion |
US20100255926A1 (en) * | 2006-12-22 | 2010-10-07 | David Hueber | Golf club with flexible grip portion |
US20120100927A1 (en) * | 2008-04-08 | 2012-04-26 | Martin John Lenzini | Inhibiting vibration in sports equipment and hand tools |
US20130172099A1 (en) * | 2011-12-29 | 2013-07-04 | Dunlop Sports Co. Ltd. | Golf club shaft and golf club |
US20130172097A1 (en) * | 2011-12-29 | 2013-07-04 | Dunlop Sports Co. Ltd. | Golf club shaft |
US9861869B2 (en) * | 2016-03-08 | 2018-01-09 | Gery Wilkowski | Universal lie-balanced putter system |
-
1931
- 1931-12-31 US US584172A patent/US1968616A/en not_active Expired - Lifetime
Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4046413A (en) * | 1976-09-14 | 1977-09-06 | Atlantic Products Corporation | Golf ball retriever |
US4330126A (en) * | 1979-08-30 | 1982-05-18 | Brunswick Corporation | High flex golf shaft having reverse tapered butt section |
US4696468A (en) * | 1982-07-20 | 1987-09-29 | Dube Brian J | Juggling club |
FR2580506A1 (en) * | 1985-04-19 | 1986-10-24 | Viellard Paul Henri | Method for manufacturing golf clubs obtained by hooping composite metal materials enabling their mechanical and metrological properties to be controlled |
WO1986006286A1 (en) * | 1985-04-19 | 1986-11-06 | Viellard Paul Henri | Golf clubs and method for their fabrication |
US4954198A (en) * | 1985-04-19 | 1990-09-04 | Viellard Paul H | Method of fabricating golf clubs and assembly of tubes for forming clubs obtained by the method |
FR2581887A1 (en) * | 1985-05-15 | 1986-11-21 | Viellard Paul Henri | Method for manufacturing golf clubs and set of tubes intended to produce clubs obtained by the method |
US5253867A (en) * | 1989-09-27 | 1993-10-19 | Gafner Donald M | Multi-component shaft for golf clubs |
US5080363A (en) * | 1990-05-10 | 1992-01-14 | Soong Tsai C | Sports equipment with enhanced flexibility |
US5054781A (en) * | 1990-05-10 | 1991-10-08 | Soong Tsai C | Sports equipment with enhanced flexibility |
US5294119A (en) * | 1991-09-27 | 1994-03-15 | Taylor Made Golf Company, Inc. | Vibration-damping device for a golf club |
AU656226B2 (en) * | 1991-09-27 | 1995-01-27 | Taylor Made Golf Company, Inc. | Device for reducing the vibrations of a golf club |
US5655975A (en) * | 1995-06-07 | 1997-08-12 | Roush Anatrol, Inc. | Golf club having vibration damping device and method for making same |
USRE38983E1 (en) | 1995-06-13 | 2006-02-14 | Adams Golf Ip, Lp | Golf club shaft and insert therefor |
US5674134A (en) * | 1995-10-03 | 1997-10-07 | Blankenship; William A. | Golf club shaft extender |
US5935027A (en) * | 1995-12-28 | 1999-08-10 | Roush Anatrol, Inc. | Multi-mode vibration absorbing device for implements |
US5904627A (en) * | 1996-05-01 | 1999-05-18 | Kasco Corporation | Golf club shaft |
US6196930B1 (en) * | 1997-11-12 | 2001-03-06 | Randy T. Aumock | Extension apparatus for golf club |
US6231456B1 (en) | 1999-04-05 | 2001-05-15 | Graham Rennie | Golf shaft vibration damper |
US6343999B1 (en) | 1999-09-20 | 2002-02-05 | Adams Golf Ip Lp | Set of golf club shafts |
US6203447B1 (en) | 1999-12-07 | 2001-03-20 | True Temper Sports, Inc. | Bonding apparatus for modular shafts |
US20040229709A1 (en) * | 2003-05-16 | 2004-11-18 | Soren Solari | Golf putter construction |
US20080032812A1 (en) * | 2006-08-04 | 2008-02-07 | Sorenson James W | Weighted golf club |
US7736244B2 (en) * | 2006-12-22 | 2010-06-15 | David Hueber | Golf club with flexible grip portion |
US20080153620A1 (en) * | 2006-12-22 | 2008-06-26 | David Hueber | Golf club with flexible grip portion |
US20100255926A1 (en) * | 2006-12-22 | 2010-10-07 | David Hueber | Golf club with flexible grip portion |
US20120100927A1 (en) * | 2008-04-08 | 2012-04-26 | Martin John Lenzini | Inhibiting vibration in sports equipment and hand tools |
US20130172099A1 (en) * | 2011-12-29 | 2013-07-04 | Dunlop Sports Co. Ltd. | Golf club shaft and golf club |
US20130172097A1 (en) * | 2011-12-29 | 2013-07-04 | Dunlop Sports Co. Ltd. | Golf club shaft |
US8915796B2 (en) * | 2011-12-29 | 2014-12-23 | Dunlop Sports Co. Ltd | Golf club shaft and golf club |
US8936516B2 (en) * | 2011-12-29 | 2015-01-20 | Dunlop Sports Co., Ltd. | Golf club shaft |
US9861869B2 (en) * | 2016-03-08 | 2018-01-09 | Gery Wilkowski | Universal lie-balanced putter system |
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