Stromberg-Carlson Bulletin No. 13 Intercommunicating Telephones 1905

This document contains information regarding Stromberg-Carlson Intercommunicating Telephones from the early 1900’s. Topics include Advantages of the Intercommunicating Telephone System, Plug Type Intercommunicating Telephones, Telephone Parts, Central Energy Wall Telephone, Desk Telephone, Combination Telephone, Connecting with Exchange Systems, Answering Stations, and Private Line Telephones.