Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 719
FIG. 503.-SELECTOR SWITCH, FRONT VIEW.096 … FIG. 604.-SELECTOR SWITCH, SIDE VIEW.697 698 AMERICAN TELEPHONE PRACTICE. that the rotary movement of the wipers will continue until thewipers engage a trunk line that is not in use. By this means, that is, by the first series of impulses sent overthe subscribers line in making a call, the line of…
Telephone
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