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2923875
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Patent number 2,923,875
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Issue date Feb 2, 1960
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2431083
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Patent number 2,431,083
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Issue date Nov 18, 1947
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2169031
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Patent number 2,169,031
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Issue date Aug 8, 1939
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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1948119
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Patent number 1,948,119
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Issue date Feb 20, 1934
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER