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2849672
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Patent number 2,849,672
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Patent number 2,704,334
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2429764
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G08 - SIGNALLING
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2363433
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Patent number 2,363,433
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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1623665
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER