The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 531
Fig. 465.—Section of No. 9 Switch-Board the refinements in detail necessary with the larger switch-boards. Line Connections.—Fig. 466 shows the full connections ofthe board. The jacks are 5-point break ones multipled at 502 PRACTICAL TELEPHONE HANDBOOK … aUVOB U0103NN036 c 83dwnp I H3Vb 3NI133NN03O O n nil » ;a
Telephone
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