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Electronic telephone relay
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Patent number 4,555,593
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Issue date Nov 26, 1985
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Microcommunications, Inc.
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Orrin B. O'Dea
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Dial pulse detector
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Patent number 4,326,105
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Issue date Apr 20, 1982
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Mitel Corporation
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Brian J. N. Vaughan
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Dial pulse restorer
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Patent number 4,319,091
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Issue date Mar 9, 1982
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Dictaphone Corporation
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Kalju Meri
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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-
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Minimum break/make pulse corrector
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Patent number 4,223,184
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Issue date Sep 16, 1980
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Bell Telephone Laboratories, Incorporated
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John L. Gilmer
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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-
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Ringing signal detector
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Patent number 4,184,053
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Issue date Jan 15, 1980
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Iwasaki Tsushinki Kabushiki Kaisha
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Norio Saneyoshi
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Dial impulse relay circuit
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Patent number 4,087,644
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Issue date May 2, 1978
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Nippon Tsu Shin Kogyo K.K.
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Fumikazu Hamatani
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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-
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Regeneration of signalling pulses
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Patent number 3,985,970
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Issue date Oct 12, 1976
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Societe Lignes Telegraphiques et Telephoniques
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Raymond Lerault
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3919486
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Patent number 3,919,486
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Issue date Nov 11, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3908091
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Patent number 3,908,091
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Issue date Sep 23, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3879583
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Patent number 3,879,583
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Issue date Apr 22, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3794775
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Patent number 3,794,775
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Issue date Feb 26, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3781482
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Patent number 3,781,482
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Issue date Dec 25, 1973
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3772477
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Patent number 3,772,477
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Issue date Nov 13, 1973
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3772474
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Patent number 3,772,474
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Issue date Nov 13, 1973
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3766323
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Patent number 3,766,323
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Issue date Oct 16, 1973
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3700821
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Patent number 3,700,821
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Issue date Oct 24, 1972
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H04 - ELECTRIC COMMUNICATION TECHNIQUE