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3737792
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Patent number 3,737,792
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Issue date Jun 5, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY
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3737807
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Patent number 3,737,807
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Issue date Jun 5, 1973
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H03 - BASIC ELECTRONIC CIRCUITRY
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3628154
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Patent number 3,628,154
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Issue date Dec 14, 1971
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H03 - BASIC ELECTRONIC CIRCUITRY
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3611195
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Patent number 3,611,195
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Issue date Oct 5, 1971
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H03 - BASIC ELECTRONIC CIRCUITRY
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3525941
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Patent number 3,525,941
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Issue date Aug 25, 1970
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H03 - BASIC ELECTRONIC CIRCUITRY