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3683845
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Patent number 3,683,845
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Issue date Aug 15, 1972
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3631482
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Patent number 3,631,482
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Issue date Dec 28, 1971
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3553686
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Patent number 3,553,686
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Issue date Jan 5, 1971
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3550118
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Patent number 3,550,118
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Issue date Dec 22, 1970
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3451057
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Patent number 3,451,057
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Issue date Jun 17, 1969
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3440649
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Patent number 3,440,649
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Issue date Apr 22, 1969
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3424124
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Patent number 3,424,124
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Issue date Jan 28, 1969
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3392383
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Patent number 3,392,383
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Issue date Jul 9, 1968
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3371340
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Patent number 3,371,340
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Issue date Feb 27, 1968
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3360691
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Patent number 3,360,691
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Issue date Dec 26, 1967
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3346858
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Patent number 3,346,858
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Issue date Oct 10, 1967
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3298020
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Patent number 3,298,020
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Issue date Jan 10, 1967
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3284798
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Patent number 3,284,798
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Issue date Nov 8, 1966
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3238525
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Patent number 3,238,525
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Issue date Mar 1, 1966
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3168730
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Patent number 3,168,730
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Issue date Feb 2, 1965
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3162850
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Patent number 3,162,850
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Issue date Dec 22, 1964
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3116481
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Patent number 3,116,481
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Issue date Dec 31, 1963
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3054997
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Patent number 3,054,997
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2984832
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Patent number 2,984,832
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Issue date May 16, 1961
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2925593
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Patent number 2,925,593
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Issue date Feb 16, 1960
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2904783
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Patent number 2,904,783
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Issue date Sep 15, 1959
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2896190
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Patent number 2,896,190
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Issue date Jul 21, 1959
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G08 - SIGNALLING
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2875433
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Patent number 2,875,433
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Issue date Feb 24, 1959
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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2817080
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Patent number 2,817,080
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Issue date Dec 17, 1957
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G10 - MUSICAL INSTRUMENTS ACOUSTICS