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3641352
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Patent number 3,641,352
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Issue date Feb 8, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3634713
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Patent number 3,634,713
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Issue date Jan 11, 1972
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H01 - BASIC ELECTRIC ELEMENTS
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3573464
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Patent number 3,573,464
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Issue date Apr 6, 1971
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H01 - BASIC ELECTRIC ELEMENTS
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2228895
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Patent number 2,228,895
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Issue date Jan 14, 1941
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H01 - BASIC ELECTRIC ELEMENTS
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2156625
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Patent number 2,156,625
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Issue date May 2, 1939
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H01 - BASIC ELECTRIC ELEMENTS
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2130152
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Patent number 2,130,152
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Issue date Sep 13, 1938
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H01 - BASIC ELECTRIC ELEMENTS