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2972145
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Issue date Feb 14, 1961
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H01 - BASIC ELECTRIC ELEMENTS
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Issue date Sep 26, 1950
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H01 - BASIC ELECTRIC ELEMENTS
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Patent number 2,513,313
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Issue date Jul 4, 1950
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H01 - BASIC ELECTRIC ELEMENTS
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2326945
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Patent number 2,326,945
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Issue date Aug 17, 1943
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H01 - BASIC ELECTRIC ELEMENTS