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American Bell Telephone
American Electric
American Speaking Telephone Co.
Andrae Telephones
AT&T / Bell System
ATC
Automatic Electric
Bang & Olufsen
Bell Canada
Bell Labs
Bell Telephone
Bell Telephone Manufacturing Company
Charles Williams Jr. Shop
Chesapeake & Potomac Telephone
Chicago Telephone Supply
Connecticut Telephone
Cumberland Telephone
Deutsche Bundespost/Telekom
DeVeau Telephone
Dictograph Products
Elektrisk Bureau
Eureka Electric
Farr Telephone
General Post Office/BT
Gray Telephone Pay Station
GTE (current)
H. Fuld & Co./TN
Hose-McCann
ITT
Kellogg Switchboard and Supply
Keystone Telephone
Krone
L.M. Ericsson
Leich
Lincoln Telephone
Manhattan Electrical Supply
MCI
Mianus Electric
Monarch Telephone
Motorola
Mountain States Telephone
National Telephone Co. (UK)
National Telephone Mfg. Co.
NEC Corp.
New England Telephone
New York Telephone
North Electric
Northern Electric/Telecom
NTT
Pacific Northwest Bell
Pacific Telephone
Phoenix Electric Telephone Co.
PTT/France Telecom
Roycroft Shops
S.H. Couch Co.
SAFNAT Milano
Siemens
Société Industrielle des Téléphones
Southern Bell
Southwestern Bell
Stromberg-Carlson
Swedish-American
Telequest
Televerket
Tyco
Viaduct Manufacturing
Western Electric
Western Telephone
Western Union
Wilhelm Telephone Mfg.
Wisconsin Telephone
GTE
Largest U.S. 20th century independent telco
From Wikipedia
GTE Corporation, formerly General Telephone & Electronics Corporation (1955–1982), was the largest independent telephone company in the United States during the days of the Bell System. The company operated from 1926, with roots tracing further back than that, until 2000, when it was acquired by Bell Atlantic, which then changed its name to Verizon.
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