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3413514
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H01 - BASIC ELECTRIC ELEMENTS
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2951898
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H01 - BASIC ELECTRIC ELEMENTS
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2866918
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H01 - BASIC ELECTRIC ELEMENTS
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2775719
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H01 - BASIC ELECTRIC ELEMENTS
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2756363
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Patent number 2,756,363
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H01 - BASIC ELECTRIC ELEMENTS
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2755462
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Patent number 2,755,462
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G01 - MEASURING TESTING
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2735935
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Patent number 2,735,935
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H01 - BASIC ELECTRIC ELEMENTS
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2654853
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Patent number 2,654,853
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H01 - BASIC ELECTRIC ELEMENTS
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2622219
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H01 - BASIC ELECTRIC ELEMENTS
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2585057
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Patent number 2,585,057
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H01 - BASIC ELECTRIC ELEMENTS
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2544755
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Patent number 2,544,755
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H01 - BASIC ELECTRIC ELEMENTS
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2504972
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Patent number 2,504,972
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Issue date Apr 25, 1950
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2458517
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H03 - BASIC ELECTRONIC CIRCUITRY
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2440735
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H01 - BASIC ELECTRIC ELEMENTS
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2440736
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Patent number 2,440,736
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H01 - BASIC ELECTRIC ELEMENTS
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2369569
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H01 - BASIC ELECTRIC ELEMENTS
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2361255
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2355110
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Patent number 2,355,110
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H01 - BASIC ELECTRIC ELEMENTS
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2339662
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Patent number 2,339,662
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H01 - BASIC ELECTRIC ELEMENTS
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2335705
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H01 - BASIC ELECTRIC ELEMENTS
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2325676
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G01 - MEASURING TESTING
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2324534
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Patent number 2,324,534
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H01 - BASIC ELECTRIC ELEMENTS
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2265365
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Patent number 2,265,365
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H01 - BASIC ELECTRIC ELEMENTS
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2264488
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Patent number 2,264,488
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H01 - BASIC ELECTRIC ELEMENTS
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2260911
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Patent number 2,260,911
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H01 - BASIC ELECTRIC ELEMENTS
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2258791
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Patent number 2,258,791
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H01 - BASIC ELECTRIC ELEMENTS
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2254140
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Patent number 2,254,140
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H01 - BASIC ELECTRIC ELEMENTS
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2250927
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Patent number 2,250,927
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H01 - BASIC ELECTRIC ELEMENTS
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2250721
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Patent number 2,250,721
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Issue date Jul 29, 1941
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H01 - BASIC ELECTRIC ELEMENTS
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2250476
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Patent number 2,250,476
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H04 - ELECTRIC COMMUNICATION TECHNIQUE