Efficiency increased through improved coordination in planning, designing, and arrangement of toll plant; plant described as comprehensive countrywide network of toll circuit facilities connecting important switching offices over which practically all traffic, not handled by direct circuits, will be routed.
Standard switching plan for telephone toll service
Commercial Standards Monthly
Commercial Standards Monthly ; 7 , n 11
1931
2 pages
Standard
English
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A general switching plan for telephone toll service
Engineering Index Backfile | 1930
|A general switching plan for telephone toll service
Engineering Index Backfile | 1930
|A general switching plan for telephone toll service
Engineering Index Backfile | 1930
|Engineering Index Backfile | 1934
|