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3152267
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Patent number 3,152,267
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Issue date Oct 6, 1964
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H03 - BASIC ELECTRONIC CIRCUITRY
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3088047
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Patent number 3,088,047
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Issue date Apr 30, 1963
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3083306
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Patent number 3,083,306
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Issue date Mar 26, 1963
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H03 - BASIC ELECTRONIC CIRCUITRY
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2819413
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Patent number 2,819,413
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Issue date Jan 7, 1958
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H03 - BASIC ELECTRONIC CIRCUITRY