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The Central Office Teletypewriter AN/MGC-17 is a mobile central office containing facilities for three full-duplex or half-duplex typewriter circuits including one secure circuit and switching facilities for 12 subscriber lines. Includes one typewriter TT-4A/TG, two teletypewriter Reperforator Transmitters TT-76B/GGC, one Manual Telephone Switchboard SB-22A/PT and other equipment.