Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 259
THE SYSTEM OF THE WESTERN ELECTRIC COMPANY 237 used except Q and Z. The last hole bears the digit 0 and theword OPERATOR. The plan proposed is that the subscriber shall dial the bold-facedletters of the office name, followed by the four digits of the number of theline in the office. In smaller…
Telephone
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