The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 319
bles are tied in vertical rows to the left-handside of the horizontal supporting bars of the frame. From the horizontal side of the intermediate frame 63-wirecables are used to connect to the multiple-jacks on the switch-board. A duplicate, or even triplicate, set of cables may be 29o PRACTICAL…
Telephone
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