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3924191
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Patent number 3,924,191
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Issue date Dec 2, 1975
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H03 - BASIC ELECTRONIC CIRCUITRY
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3855535
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Patent number 3,855,535
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Issue date Dec 17, 1974
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H03 - BASIC ELECTRONIC CIRCUITRY
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3849731
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Patent number 3,849,731
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Issue date Nov 19, 1974
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H03 - BASIC ELECTRONIC CIRCUITRY
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3839681
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Patent number 3,839,681
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Issue date Oct 1, 1974
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H03 - BASIC ELECTRONIC CIRCUITRY
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3746886
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Patent number 3,746,886
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Issue date Jul 17, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY
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3743944
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Patent number 3,743,944
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Issue date Jul 3, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY