Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 204
Um ^^ . (Jt- … FIG. 162.-CIRCUITS MAGNETO SWITCH-BOARD-SUBSCRIBERSCONVERSING. however, to place approximately lo such pairs for each loO sub-scribers in the system, it being found that this number is sufficientto meet the requirements at the busiest periods of the day. This,of course, provides service permitting…
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