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3928725
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Issue date Dec 23, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3886316
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Patent number 3,886,316
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3865988
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3859469
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Patent number 3,859,469
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3846588
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3836720
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3761633
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3689896
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3668318
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Patent number 3,668,318
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3641271
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3629839
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3626314
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Patent number 3,626,314
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3624304
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Patent number 3,624,304
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3617642
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Patent number 3,617,642
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3588366
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Patent number 3,588,366
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3568064
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3534362
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G11 - INFORMATION STORAGE
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3520998
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Patent number 3,520,998
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3519747
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3517135
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Patent number 3,517,135
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3517132
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Patent number 3,517,132
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Issue date Jun 23, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3505477
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Patent number 3,505,477
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3501593
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Patent number 3,501,593
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3499119
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H04 - ELECTRIC COMMUNICATION TECHNIQUE