direction. When the Telephone is hung up, the line is restored for the use of others upon the same circuit, the Indicator simply governing the talking. SUPPLIES OF ALL KINDS. Additional to the superiorities it possesses as a Secrecy Switch, it has an excellent feature in that all of our Bells can'…
Telegraph -- Periodicals
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
