The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 363
Fig. 325 Fig. 326. -Terminating on J BoltIron Arm National Telephone Co. for all ordinary purposes. The straight bolt shown in connection with the Cordeaux in-sulator, Fig. 325, is only suitable for straight, or nearly straight,through work. For terminating—that is, when the wires arecut at the…
Telephone
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