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Ice screw with non-linear taper
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Patent number 6,505,799
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Issue date Jan 14, 2003
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Black Diamond Equipment, Ltd. Inc.
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John Bercaw
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A63 - SPORTS GAMES AMUSEMENTS
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Piton assembly
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Patent number 5,118,061
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Issue date Jun 2, 1992
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Thomas F. Byrne
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A63 - SPORTS GAMES AMUSEMENTS
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3467351
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Patent number 3,467,351
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Issue date Sep 16, 1969
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A63 - SPORTS GAMES AMUSEMENTS