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3564108
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Patent number 3,564,108
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Issue date Feb 16, 1971
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H01 - BASIC ELECTRIC ELEMENTS
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3474357
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Patent number 3,474,357
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Issue date Oct 21, 1969
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H01 - BASIC ELECTRIC ELEMENTS
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2483301
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Patent number 2,483,301
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Issue date Sep 27, 1949
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H01 - BASIC ELECTRIC ELEMENTS
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2306850
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Patent number 2,306,850
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Issue date Dec 29, 1942
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H01 - BASIC ELECTRIC ELEMENTS
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1866611
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Patent number 1,866,611
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Issue date Jul 12, 1932
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H01 - BASIC ELECTRIC ELEMENTS