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1287451
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Patent number 1,287,451
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Issue date Dec 10, 1918
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H01 - BASIC ELECTRIC ELEMENTS
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1036508
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Patent number 1,036,508
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Issue date Aug 20, 1912
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H01 - BASIC ELECTRIC ELEMENTS
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1028259
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Patent number 1,028,259
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Issue date Jun 4, 1912
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H01 - BASIC ELECTRIC ELEMENTS
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804603
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Patent number 804,603
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Issue date Nov 14, 1905
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H01 - BASIC ELECTRIC ELEMENTS
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620111
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Patent number 620,111
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Issue date Feb 28, 1899
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H01 - BASIC ELECTRIC ELEMENTS
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396579
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Patent number 396,579
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Issue date Jan 22, 1889
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H01 - BASIC ELECTRIC ELEMENTS
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304593
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Patent number 304,593
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Issue date Sep 2, 1884
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H01 - BASIC ELECTRIC ELEMENTS