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3838376
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Patent number 3,838,376
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Issue date Sep 24, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3818409
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Patent number 3,818,409
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H01 - BASIC ELECTRIC ELEMENTS
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Patent number 3,194,925
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Issue date Jul 13, 1965
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H01 - BASIC ELECTRIC ELEMENTS
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Patent number 2,411,460
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Issue date Nov 19, 1946
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H01 - BASIC ELECTRIC ELEMENTS