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3922565
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Patent number 3,922,565
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Issue date Nov 25, 1975
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H03 - BASIC ELECTRONIC CIRCUITRY
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3895392
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Patent number 3,895,392
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Issue date Jul 15, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3817794
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Patent number 3,817,794
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Issue date Jun 18, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3566218
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Patent number 3,566,218
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Issue date Feb 23, 1971
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H01 - BASIC ELECTRIC ELEMENTS