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2857473
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Patent number 2,857,473
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Issue date Oct 21, 1958
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H01 - BASIC ELECTRIC ELEMENTS
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2808460
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Patent number 2,808,460
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Issue date Oct 1, 1957
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H01 - BASIC ELECTRIC ELEMENTS
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2778879
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Patent number 2,778,879
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Issue date Jan 22, 1957
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2559600
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Patent number 2,559,600
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Issue date Jul 10, 1951
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H01 - BASIC ELECTRIC ELEMENTS
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2542997
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Patent number 2,542,997
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Issue date Feb 27, 1951
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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2519695
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Patent number 2,519,695
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Issue date Aug 22, 1950
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H01 - BASIC ELECTRIC ELEMENTS
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2492979
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Patent number 2,492,979
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Issue date Jan 3, 1950
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G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
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2423131
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Patent number 2,423,131
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Issue date Jul 1, 1947
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H01 - BASIC ELECTRIC ELEMENTS
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2346912
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Patent number 2,346,912
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H01 - BASIC ELECTRIC ELEMENTS
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2327792
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Patent number 2,327,792
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2197501
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Patent number 2,197,501
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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1960004
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H01 - BASIC ELECTRIC ELEMENTS
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1608500
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H01 - BASIC ELECTRIC ELEMENTS
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1500687
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Patent number 1,500,687
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H01 - BASIC ELECTRIC ELEMENTS