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3917920
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Patent number 3,917,920
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Issue date Nov 4, 1975
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H01 - BASIC ELECTRIC ELEMENTS
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3840717
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Patent number 3,840,717
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H01 - BASIC ELECTRIC ELEMENTS
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3684849
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Patent number 3,684,849
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H01 - BASIC ELECTRIC ELEMENTS
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3346710
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H01 - BASIC ELECTRIC ELEMENTS
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3194930
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H01 - BASIC ELECTRIC ELEMENTS
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3171939
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H01 - BASIC ELECTRIC ELEMENTS
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2620415
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Issue date Dec 2, 1952
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H01 - BASIC ELECTRIC ELEMENTS
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2498531
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Patent number 2,498,531
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H01 - BASIC ELECTRIC ELEMENTS
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2489070
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H01 - BASIC ELECTRIC ELEMENTS
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2097940
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H01 - BASIC ELECTRIC ELEMENTS
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1918248
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Patent number 1,918,248
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H01 - BASIC ELECTRIC ELEMENTS
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1785194
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H01 - BASIC ELECTRIC ELEMENTS
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1776503
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Patent number 1,776,503
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H01 - BASIC ELECTRIC ELEMENTS
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1736369
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Patent number 1,736,369
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H01 - BASIC ELECTRIC ELEMENTS
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1578422
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H01 - BASIC ELECTRIC ELEMENTS
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1527750
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H01 - BASIC ELECTRIC ELEMENTS
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1437778
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H01 - BASIC ELECTRIC ELEMENTS
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1424266
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H01 - BASIC ELECTRIC ELEMENTS
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1391955
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H01 - BASIC ELECTRIC ELEMENTS
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1354525
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H01 - BASIC ELECTRIC ELEMENTS