The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 261
I CM 234 PRACTICAL TELEPHONE HANDBOOK A general view of the switch-room is given in Fig. 252, as … Fig. 253.—Back of Switch-board seen from near the switch-room managers desk. Only veryfew of the operators are in attendance.
Telephone
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