1880
1882
Early Ericsson telephone
Telephone Exchanges open in Berlin, Vienna, and Sydney
PDF:
American Bell Telephone Annual Report, 1881
Ad: 1881 ad in Boston phone directory
First telephone lines in Constantinople and Egypt
Metallic circuit introduced
Operators working at a 'pyramid' switchboard
Bell ends technical role at Bell Telephone, establishes Volta Laboratory
Watson retires from Bell at age 27
National Telephone Co formed by merger of Bell and Edison interests
Bell acquires Western Electric, and Enos Barton takes over engineering
