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3487180
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H01 - BASIC ELECTRIC ELEMENTS
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3483344
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H01 - BASIC ELECTRIC ELEMENTS
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3379894
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Patent number 3,379,894
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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H01 - BASIC ELECTRIC ELEMENTS
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3081410
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H01 - BASIC ELECTRIC ELEMENTS
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE