The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 534
SB 3 bO /^JV buijaMSyy SPECIAL EXCHANGE SYSTEMS 505 … 5o5 PRACTICAL TELEPHONE HANDBOOK Exchange, where this type of board has been installed. Certainmodifications have been necessary, however, to adapt it for
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