William H. Sprague, Jr.

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Papillion, NE, US

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Patents Grantslast 30 patents

Information Patent Grant
Gradually progressive bore BB-flat, CC, E-flat, F, or B-flat valved...
- Patent number 7,161,077
- Issue date Jan 9, 2007
- Robert C. Fry
- G10 - MUSICAL INSTRUMENTS ACOUSTICS