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2493575
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Patent number 2,493,575
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Issue date Jan 3, 1950
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2332325
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Patent number 2,332,325
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Issue date Oct 19, 1943
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2156886
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Patent number 2,156,886
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Issue date May 2, 1939
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2095124
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Patent number 2,095,124
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Issue date Oct 5, 1937
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER