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3157841
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Patent number 3,157,841
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Issue date Nov 17, 1964
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H03 - BASIC ELECTRONIC CIRCUITRY
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3114116
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Patent number 3,114,116
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Issue date Dec 10, 1963
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H03 - BASIC ELECTRONIC CIRCUITRY
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2602139
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Patent number 2,602,139
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Issue date Jul 1, 1952
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H03 - BASIC ELECTRONIC CIRCUITRY
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2495177
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Patent number 2,495,177
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Issue date Jan 17, 1950
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H03 - BASIC ELECTRONIC CIRCUITRY
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2258128
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Patent number 2,258,128
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Issue date Oct 7, 1941
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2163403
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Patent number 2,163,403
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Issue date Jun 20, 1939
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H04 - ELECTRIC COMMUNICATION TECHNIQUE