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'DATA COMMUNICATION SYSTEM TYPE GH210- USERS HANDBOOK FOR OPERATION WITH MAGNETIC TAPE UNIT' by Standard Telephones and Cables limited (STC). Gives operating procedures and general information on GH210 data terminals when operating with the GH210 Magnetic Tape Unit (MTU), and also includes a list of the equipment required and its operating speeds. Was used at Blackfriars (head office) between 1972 and 1980 for transmitting branch orders to depots.