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3039074
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Patent number 3,039,074
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Issue date Jun 12, 1962
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2997683
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Patent number 2,997,683
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Issue date Aug 22, 1961
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2834015
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Patent number 2,834,015
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Issue date May 6, 1958
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H01 - BASIC ELECTRIC ELEMENTS
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2640934
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Patent number 2,640,934
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Issue date Jun 2, 1953
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H01 - BASIC ELECTRIC ELEMENTS
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2591297
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Patent number 2,591,297
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Issue date Apr 1, 1952
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H01 - BASIC ELECTRIC ELEMENTS