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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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Patent number 2,495,122
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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2156074
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Patent number 2,156,074
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Issue date Apr 25, 1939
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H01 - BASIC ELECTRIC ELEMENTS
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2089358
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Patent number 2,089,358
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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2008496
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Patent number 2,008,496
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Issue date Jul 16, 1935
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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1963160
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Patent number 1,963,160
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Issue date Jun 19, 1934
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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1890330
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Patent number 1,890,330
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Issue date Dec 6, 1932
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H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR