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3863930
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Patent number 3,863,930
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Issue date Feb 4, 1975
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A63 - SPORTS GAMES AMUSEMENTS
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3751039
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Patent number 3,751,039
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Issue date Aug 7, 1973
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A63 - SPORTS GAMES AMUSEMENTS
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3648403
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Patent number 3,648,403
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Issue date Mar 14, 1972
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A63 - SPORTS GAMES AMUSEMENTS
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2534055
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Patent number 2,534,055
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Issue date Dec 12, 1950
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A63 - SPORTS GAMES AMUSEMENTS