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3863024
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Patent number 3,863,024
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Issue date Jan 28, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3825834
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Patent number 3,825,834
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Issue date Jul 23, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3750026
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Patent number 3,750,026
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Issue date Jul 31, 1973
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3537007
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Patent number 3,537,007
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Issue date Oct 27, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3489848
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Patent number 3,489,848
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Issue date Jan 13, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3487337
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Patent number 3,487,337
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Issue date Dec 30, 1969
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3413413
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Patent number 3,413,413
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Issue date Nov 26, 1968
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3403340
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Patent number 3,403,340
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Issue date Sep 24, 1968
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H04 - ELECTRIC COMMUNICATION TECHNIQUE