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Pipe organ
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Patent number 4,408,517
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Issue date Oct 11, 1983
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Leonard W. Ellen
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Electronic pipe valve
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Patent number 4,341,145
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Issue date Jul 27, 1982
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Richard H. Peterson
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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Musical instruments
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Patent number 4,088,051
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Issue date May 9, 1978
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Leonard W. Ellen
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3138053
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Patent number 3,138,053
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Issue date Jun 23, 1964
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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1604467
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Patent number 1,604,467
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Issue date Oct 26, 1926
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G10 - MUSICAL INSTRUMENTS ACOUSTICS