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 90
H04JMS2UI1 RlDLUUd LUOJJ … 74 AUTOMATIC TELEPHONY represents the apparatus of a sub-office, while the remaining apparatusis assumed to be local to the main office At the left of the figure atelephone line is shown terminating on a primary lineswitch. Theselineswitches have access to trunks passing through a…
Telephone
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