John F. Brennan

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Lebanon, KY, US

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Patents Grantslast 30 patents

Information Patent Grant
Electromagnetic devices for actuating piano keys
- Patent number 4,383,464
- Issue date May 17, 1983
- John F. Brennan
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Electromagnetic devices for actuating piano keys
- Patent number 4,338,847
- Issue date Jul 13, 1982
- John F. Brennan
- G10 - MUSICAL INSTRUMENTS ACOUSTICS