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3325580
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Patent number 3,325,580
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Issue date Jun 13, 1967
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3154701
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Patent number 3,154,701
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Issue date Oct 27, 1964
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3080785
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Patent number 3,080,785
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Issue date Mar 12, 1963
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3073203
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Patent number 3,073,203
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Issue date Jan 15, 1963
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G10 - MUSICAL INSTRUMENTS ACOUSTICS