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2416927
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H01 - BASIC ELECTRIC ELEMENTS
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Patent number 2,217,186
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H01 - BASIC ELECTRIC ELEMENTS
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Patent number 2,201,819
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H01 - BASIC ELECTRIC ELEMENTS
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2179601
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Patent number 2,179,601
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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1962158
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Issue date Jun 12, 1934
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H01 - BASIC ELECTRIC ELEMENTS