Telecom Patents
American Bell Telephone Company
A. G. Bell
American Telephone and Telegraph Co., 1880-1920
American Telephone and Telegraph Co., 1921-1930
American Telephone and Telegraph Co., 1931-1940
American Telephone and Telegraph Co., 1941-1985
Automatic Electric Co., 1880-1920
Bell Telephone Laboratories, 1926-1930
Bell Telephone Laboratories, 1931-1940
Bell Telephone Laboratories, 1941-1945
Bell Telephone Laboratories, 1946-1950
Bell Telephone Laboratories, 1951-1955
Bell Telephone Laboratories, 1956-1960
Bell Telephone Laboratories, 1961-1965
Bell Telephone Laboratories, 1966-1970
Kellogg Switchboard & Supply Co., 1897-1953
Nikola Tesla
Stromberg-Carlson, 1890-1980
Western Electric, 1880-1900
Western Union, 1850-1950
Western Union, 1951-1975