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3815126
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H03 - BASIC ELECTRONIC CIRCUITRY
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3750156
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Patent number 3,750,156
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H03 - BASIC ELECTRONIC CIRCUITRY
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3298016
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Patent number 3,298,016
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Issue date Jan 10, 1967
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3182181
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Patent number 3,182,181
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Issue date May 4, 1965
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3182304
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Patent number 3,182,304
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Issue date May 4, 1965
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H03 - BASIC ELECTRONIC CIRCUITRY
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2877413
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H03 - BASIC ELECTRONIC CIRCUITRY