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H01 - BASIC ELECTRIC ELEMENTS
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3087023
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2923774
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H01 - BASIC ELECTRIC ELEMENTS
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2844656
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Patent number 2,844,656
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H01 - BASIC ELECTRIC ELEMENTS
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2842619
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2721904
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H01 - BASIC ELECTRIC ELEMENTS
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2657590
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H01 - BASIC ELECTRIC ELEMENTS
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2617887
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2457878
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Patent number 2,457,878
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H01 - BASIC ELECTRIC ELEMENTS
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2448608
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Patent number 2,448,608
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H01 - BASIC ELECTRIC ELEMENTS
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2389571
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2372801
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H01 - BASIC ELECTRIC ELEMENTS
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2363683
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H01 - BASIC ELECTRIC ELEMENTS
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2362632
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H01 - BASIC ELECTRIC ELEMENTS
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2351967
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H01 - BASIC ELECTRIC ELEMENTS
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2349929
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H01 - BASIC ELECTRIC ELEMENTS
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2345386
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H01 - BASIC ELECTRIC ELEMENTS
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2340811
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Patent number 2,340,811
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H01 - BASIC ELECTRIC ELEMENTS
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2334205
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Patent number 2,334,205
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H01 - BASIC ELECTRIC ELEMENTS
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2331844
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Patent number 2,331,844
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H01 - BASIC ELECTRIC ELEMENTS
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2320258
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Patent number 2,320,258
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H01 - BASIC ELECTRIC ELEMENTS
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2317743
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Patent number 2,317,743
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H01 - BASIC ELECTRIC ELEMENTS
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2315010
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2301773
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Patent number 2,301,773
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H01 - BASIC ELECTRIC ELEMENTS
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2298910
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H01 - BASIC ELECTRIC ELEMENTS
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2277191
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Patent number 2,277,191
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H01 - BASIC ELECTRIC ELEMENTS
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2271420
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H01 - BASIC ELECTRIC ELEMENTS
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2264592
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H01 - BASIC ELECTRIC ELEMENTS
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2237419
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2222126
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Patent number 2,222,126
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H04 - ELECTRIC COMMUNICATION TECHNIQUE