Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 351
circuits, connecting twoof the line circuits shown in Fig, 271. In this cord circuit theanswering and calling plug are of the two-conductor type and areconnected by two-conductor cords, as in the Kellogg system. The THE COMMON BATTERY MULTIPLE SWITCH-BOARD. 329 sleeve side of the circuit of each… … vWWWAra 1 ^
Telephone
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