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3919669
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Patent number 3,919,669
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Issue date Nov 11, 1975
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G02 - OPTICS
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3911381
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Patent number 3,911,381
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Issue date Oct 7, 1975
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3893047
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Patent number 3,893,047
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Issue date Jul 1, 1975
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H03 - BASIC ELECTRONIC CIRCUITRY
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3621482
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Patent number 3,621,482
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Issue date Nov 16, 1971
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H03 - BASIC ELECTRONIC CIRCUITRY
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3446974
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Patent number 3,446,974
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Issue date May 27, 1969
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H03 - BASIC ELECTRONIC CIRCUITRY
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3446975
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Patent number 3,446,975
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Issue date May 27, 1969
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H03 - BASIC ELECTRONIC CIRCUITRY