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3073983
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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2776392
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Patent number 2,776,392
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H01 - BASIC ELECTRIC ELEMENTS
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2495831
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H01 - BASIC ELECTRIC ELEMENTS
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2447637
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H01 - BASIC ELECTRIC ELEMENTS
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2041595
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Patent number 2,041,595
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H01 - BASIC ELECTRIC ELEMENTS
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2020962
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H01 - BASIC ELECTRIC ELEMENTS
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1951732
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H01 - BASIC ELECTRIC ELEMENTS
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1929656
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Patent number 1,929,656
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H01 - BASIC ELECTRIC ELEMENTS
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1865512
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Patent number 1,865,512
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H01 - BASIC ELECTRIC ELEMENTS
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1769092
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Patent number 1,769,092
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H01 - BASIC ELECTRIC ELEMENTS
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1652899
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H01 - BASIC ELECTRIC ELEMENTS