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3423756
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Patent number 3,423,756
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Issue date Jan 21, 1969
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G01 - MEASURING TESTING
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3286207
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Patent number 3,286,207
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Issue date Nov 15, 1966
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H01 - BASIC ELECTRIC ELEMENTS
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2999988
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Patent number 2,999,988
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Issue date Sep 12, 1961
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H01 - BASIC ELECTRIC ELEMENTS
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2997673
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Patent number 2,997,673
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Issue date Aug 22, 1961
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H01 - BASIC ELECTRIC ELEMENTS
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2951216
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Patent number 2,951,216
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Issue date Aug 30, 1960
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H01 - BASIC ELECTRIC ELEMENTS
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2944232
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Patent number 2,944,232
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Issue date Jul 5, 1960
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H03 - BASIC ELECTRONIC CIRCUITRY