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3808386
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Patent number 3,808,386
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Issue date Apr 30, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3794799
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Patent number 3,794,799
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Issue date Feb 26, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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3783214
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Patent number 3,783,214
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Issue date Jan 1, 1974
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H01 - BASIC ELECTRIC ELEMENTS
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1228907
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Patent number 1,228,907
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Issue date Jun 5, 1917
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H01 - BASIC ELECTRIC ELEMENTS
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1220220
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Patent number 1,220,220
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Issue date Mar 27, 1917
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H01 - BASIC ELECTRIC ELEMENTS
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1213751
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Patent number 1,213,751
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Issue date Jan 23, 1917
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H01 - BASIC ELECTRIC ELEMENTS