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Adjustable dumbbell
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Patent number 6,083,144
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Issue date Jul 4, 2000
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Intellbell, Inc.
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Carl K. Towley
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A63 - SPORTS GAMES AMUSEMENTS
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Exercise weight system
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Patent number 5,971,899
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Issue date Oct 26, 1999
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Intellbell, Inc.
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Carl K. Towley
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A63 - SPORTS GAMES AMUSEMENTS
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Exercise weight system
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Patent number 5,769,762
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Issue date Jun 23, 1998
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Intellbell, Inc.
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Carl K. Towley
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A63 - SPORTS GAMES AMUSEMENTS