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Golf swing gauge
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Patent number 5,303,925
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Issue date Apr 19, 1994
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Robert E. Rawson
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A63 - SPORTS GAMES AMUSEMENTS
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Swing velocity indicator
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Patent number 4,967,596
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Issue date Nov 6, 1990
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GRT, Inc.
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John F. Rilling
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A63 - SPORTS GAMES AMUSEMENTS
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Rotation displaying device
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Patent number 4,135,405
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Issue date Jan 23, 1979
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Yazaki Sogyo Kabushiki Kaisha
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Junji Fukuyo
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G01 - MEASURING TESTING
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Tachometer
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Patent number 4,109,533
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Issue date Aug 29, 1978
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Jones Instrument Corporation
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Richard J. Broadman
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G01 - MEASURING TESTING
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3868855
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Patent number 3,868,855
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Issue date Mar 4, 1975
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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2746677
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Patent number 2,746,677
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Issue date May 22, 1956
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G01 - MEASURING TESTING
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2706671
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Patent number 2,706,671
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Issue date Apr 19, 1955
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G01 - MEASURING TESTING
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2613125
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Patent number 2,613,125
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Issue date Oct 7, 1952
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G01 - MEASURING TESTING
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2551502
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Patent number 2,551,502
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Issue date May 1, 1951
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G01 - MEASURING TESTING
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2327221
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Patent number 2,327,221
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Issue date Aug 17, 1943
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G01 - MEASURING TESTING
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2326247
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Patent number 2,326,247
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Issue date Aug 10, 1943
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G01 - MEASURING TESTING
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2326246
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Patent number 2,326,246
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Issue date Aug 10, 1943
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G01 - MEASURING TESTING
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2159125
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Patent number 2,159,125
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Issue date May 23, 1939
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G01 - MEASURING TESTING
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2156084
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Patent number 2,156,084
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Issue date Apr 25, 1939
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G01 - MEASURING TESTING
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2132911
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Patent number 2,132,911
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Issue date Oct 11, 1938
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G01 - MEASURING TESTING
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2100024
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Patent number 2,100,024
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Issue date Nov 23, 1937
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G01 - MEASURING TESTING
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2095716
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Patent number 2,095,716
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Issue date Oct 12, 1937
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G01 - MEASURING TESTING
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1968542
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Patent number 1,968,542
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Issue date Jul 31, 1934
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G01 - MEASURING TESTING
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1937630
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Patent number 1,937,630
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Issue date Dec 5, 1933
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G01 - MEASURING TESTING
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1929537
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Patent number 1,929,537
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Issue date Oct 10, 1933
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G01 - MEASURING TESTING
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1927597
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Patent number 1,927,597
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Issue date Sep 19, 1933
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G01 - MEASURING TESTING
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1912668
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Patent number 1,912,668
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Issue date Jun 6, 1933
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G01 - MEASURING TESTING
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1823830
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Patent number 1,823,830
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Issue date Sep 15, 1931
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G01 - MEASURING TESTING
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1693485
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Patent number 1,693,485
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Issue date Nov 27, 1928
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G01 - MEASURING TESTING
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1692713
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Patent number 1,692,713
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Issue date Nov 20, 1928
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G01 - MEASURING TESTING