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Charles T. Helpinstill II
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Houston, TX, US
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Patents Grants
last 30 patents
Information
Patent Grant
Folding piano
Patent number
4,376,402
Issue date
Mar 15, 1983
Charles T. Helpinstill
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Breakdown piano
Patent number
4,254,684
Issue date
Mar 10, 1981
Charles T. Helpinstill
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Magnetic sensor for a musical instrument and method of constructing...
Patent number
4,212,220
Issue date
Jul 15, 1980
Charles T. Helpinstill
G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information
Patent Grant
Guitar pick-up apparatus
Patent number
4,145,944
Issue date
Mar 27, 1979
Charles T. Helpinstill
G10 - MUSICAL INSTRUMENTS ACOUSTICS