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2862147
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Patent number 2,862,147
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Issue date Nov 25, 1958
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H01 - BASIC ELECTRIC ELEMENTS
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2049338
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Patent number 2,049,338
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Issue date Jul 28, 1936
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H01 - BASIC ELECTRIC ELEMENTS
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1946570
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Patent number 1,946,570
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Issue date Feb 13, 1934
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H01 - BASIC ELECTRIC ELEMENTS
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1760667
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Patent number 1,760,667
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Issue date May 27, 1930
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H01 - BASIC ELECTRIC ELEMENTS