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Martin Raymond Mattlage
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St. Louis, MO, US
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last 30 patents
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Patent Grant
Circular chess system
Patent number
6,592,123
Issue date
Jul 15, 2003
Alan Roy Mattlage
A63 - SPORTS GAMES AMUSEMENTS
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Patent Grant
Circular chess board
Patent number
D456456
Issue date
Apr 30, 2002
Alan Roy Mattlage
D21 - Games, toys, and sports goods