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3800276
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Patent number 3,800,276
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Issue date Mar 26, 1974
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3800275
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Patent number 3,800,275
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Issue date Mar 26, 1974
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3654596
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Patent number 3,654,596
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Issue date Apr 4, 1972
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G01 - MEASURING TESTING
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3325777
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Patent number 3,325,777
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Issue date Jun 13, 1967
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G02 - OPTICS