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3692979
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Patent number 3,692,979
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Issue date Sep 19, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3668590
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Patent number 3,668,590
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Issue date Jun 6, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3521211
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Patent number 3,521,211
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Issue date Jul 21, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3495101
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Patent number 3,495,101
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Issue date Feb 10, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3495203
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Patent number 3,495,203
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Issue date Feb 10, 1970
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H01 - BASIC ELECTRIC ELEMENTS
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3143616
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H01 - BASIC ELECTRIC ELEMENTS