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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Patent number 2,215,290
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Issue date Sep 17, 1940
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H01 - BASIC ELECTRIC ELEMENTS
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2167510
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Patent number 2,167,510
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H01 - BASIC ELECTRIC ELEMENTS
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2112740
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Patent number 2,112,740
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H01 - BASIC ELECTRIC ELEMENTS
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1912794
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Patent number 1,912,794
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Issue date Jun 6, 1933
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H01 - BASIC ELECTRIC ELEMENTS