Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 486
ou < u … 464 MEASURED SERVICE. 465 tery system, and makes known to the operator the number of thesubscriber with whom he desires a connection. The operator thenmakes the connection with the called subscriber, and upon securinghis response notifies the calling subscriber to deposit a coin of theproper…
Telephone
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