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3102975
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Patent number 3,102,975
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Issue date Sep 3, 1963
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2820960
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Patent number 2,820,960
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Issue date Jan 21, 1958
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2810124
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Patent number 2,810,124
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Issue date Oct 15, 1957
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2512912
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Patent number 2,512,912
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Issue date Jun 27, 1950
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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1938712
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Patent number 1,938,712
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Issue date Dec 12, 1933
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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1921090
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Patent number 1,921,090
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Issue date Aug 8, 1933
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G10 - MUSICAL INSTRUMENTS ACOUSTICS