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 50
Fig. 33.—Sub-office with switching repeater. 10,000-line system switch on first digit. office subscriber calls a number not in his own office, the wipers of therepeater are released after each digit and no local connection is made.If he calls a number in the sub-office, the wipers are released…
Telephone
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