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3902140
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3694774
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H03 - BASIC ELECTRONIC CIRCUITRY
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3651337
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3651336
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Patent number 3,651,336
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3628054
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G10 - MUSICAL INSTRUMENTS ACOUSTICS
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3497829
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY
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3225310
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H03 - BASIC ELECTRONIC CIRCUITRY
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H03 - BASIC ELECTRONIC CIRCUITRY