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2488508
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Patent number 2,488,508
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Issue date Nov 15, 1949
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2465976
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Patent number 2,465,976
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Issue date Mar 29, 1949
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2198326
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Patent number 2,198,326
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Issue date Apr 23, 1940
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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2110284
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Patent number 2,110,284
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Issue date Mar 8, 1938
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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1824827
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Patent number 1,824,827
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Issue date Sep 29, 1931
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H04 - ELECTRIC COMMUNICATION TECHNIQUE