BSTJ 1: 1. July 1922: Philadelphia-Pittsburgh Section of the New York-Chicago Cable. (Pilliod, James J.) (1922)
leaf 2
n this section a little more in detail. On this map areshown some of the larger cities and routes of the longer and moreimportant toll and long-distance telephone lines. As indicated,these lines are mainly of the familiar aerial wire type which has beengenerally used in the past for this purpose… … 4 y±
Cable · Circuits · Circuit · Repeaters · Repeater · Coils · Loading · Telephone · Pittsburgh · Aerial · Loading coils · Telephone circuits · Technical journal · Telephone repeaters · System technical · Pole lines · Loading coil · Aerial wire · Bell system · Test boards
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
