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3311778
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Patent number 3,311,778
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Issue date Mar 28, 1967
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H01 - BASIC ELECTRIC ELEMENTS
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3277332
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Patent number 3,277,332
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Issue date Oct 4, 1966
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H01 - BASIC ELECTRIC ELEMENTS
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3099766
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Patent number 3,099,766
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Issue date Jul 30, 1963
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H01 - BASIC ELECTRIC ELEMENTS
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2900558
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Patent number 2,900,558
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Issue date Aug 18, 1959
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H01 - BASIC ELECTRIC ELEMENTS