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Geometric device
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Patent number 4,506,891
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Issue date Mar 26, 1985
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Adam Alexander
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A63 - SPORTS GAMES AMUSEMENTS
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Polyhedral puzzle
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Patent number 4,500,090
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Issue date Feb 19, 1985
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Antoliano Nieto
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A63 - SPORTS GAMES AMUSEMENTS
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Puzzle
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Patent number 4,415,158
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Issue date Nov 15, 1983
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General Symmetrics, Inc.
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Douglas A. Engel
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A63 - SPORTS GAMES AMUSEMENTS