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3528034
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Patent number 3,528,034
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Issue date Sep 8, 1970
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H03 - BASIC ELECTRONIC CIRCUITRY
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3519951
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Patent number 3,519,951
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Issue date Jul 7, 1970
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H03 - BASIC ELECTRONIC CIRCUITRY
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3470489
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Patent number 3,470,489
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Issue date Sep 30, 1969
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H03 - BASIC ELECTRONIC CIRCUITRY
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3361983
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Patent number 3,361,983
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Issue date Jan 2, 1968
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3356965
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Patent number 3,356,965
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Issue date Dec 5, 1967
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H03 - BASIC ELECTRONIC CIRCUITRY
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3222614
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Patent number 3,222,614
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Issue date Dec 7, 1965
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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3148341
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Patent number 3,148,341
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Issue date Sep 8, 1964
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H03 - BASIC ELECTRONIC CIRCUITRY
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3134928
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Patent number 3,134,928
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H03 - BASIC ELECTRONIC CIRCUITRY
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3121614
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G01 - MEASURING TESTING
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2868978
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Patent number 2,868,978
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H03 - BASIC ELECTRONIC CIRCUITRY
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2855514
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Patent number 2,855,514
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H03 - BASIC ELECTRONIC CIRCUITRY
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2658149
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Patent number 2,658,149
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H01 - BASIC ELECTRIC ELEMENTS