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Golf handgrip guide
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Patent number 5,762,563
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Issue date Jun 9, 1998
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Mark Holzhausen
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A63 - SPORTS GAMES AMUSEMENTS
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Racquet grip fitter system
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Patent number 4,160,327
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Issue date Jul 10, 1979
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Rodger L. Martin
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Grip measuring device
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Patent number 4,102,049
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Issue date Jul 25, 1978
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Carl A. Harth
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A63 - SPORTS GAMES AMUSEMENTS
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2198980
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Patent number 2,198,980
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Issue date Apr 30, 1940
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A63 - SPORTS GAMES AMUSEMENTS