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Hidden image game piece
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Patent number 7,747,472
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Issue date Jun 29, 2010
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WS Packaging Group, Inc.
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Thomas L. Barnhart
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A63 - SPORTS GAMES AMUSEMENTS
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Auditory playing device
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Patent number 5,451,178
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Issue date Sep 19, 1995
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Sony Corporation
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Hiromu Yorozu
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G06 - COMPUTING CALCULATING COUNTING
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Audio quiz game
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Patent number 5,106,097
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Issue date Apr 21, 1992
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Rykodisc
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Barry Levine
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A63 - SPORTS GAMES AMUSEMENTS