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Hansan Ma
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Cape Elizabeth, ME, US
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last 30 patents
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Patent Grant
Ball with a passive sound device
Patent number
5,253,866
Issue date
Oct 19, 1993
Tonka Corporation
Randall H. Moorman
A63 - SPORTS GAMES AMUSEMENTS
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Patent Grant
Curve ball
Patent number
4,919,422
Issue date
Apr 24, 1990
Tonka Corporation
Hansan Ma
A63 - SPORTS GAMES AMUSEMENTS