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3771104
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Patent number 3,771,104
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Issue date Nov 6, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3750089
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Patent number 3,750,089
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Issue date Jul 31, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3710305
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Patent number 3,710,305
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Issue date Jan 9, 1973
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H01 - BASIC ELECTRIC ELEMENTS
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3579172
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Patent number 3,579,172
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Issue date May 18, 1971
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H01 - BASIC ELECTRIC ELEMENTS
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3154363
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Patent number 3,154,363
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Issue date Oct 27, 1964
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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2908884
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Patent number 2,908,884
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Issue date Oct 13, 1959
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H01 - BASIC ELECTRIC ELEMENTS
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2801396
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Patent number 2,801,396
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Issue date Jul 30, 1957
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H01 - BASIC ELECTRIC ELEMENTS