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Ackerman-Boland
Allen-Hussey Co.
American Bell Telephone
American Electric
American Speaking Telephone Co.
Andrae Telephones
AT&T / Bell System
ATC
Automatic Direct Line Telephone Co.
Automatic Electric
B-R Electric
Bang & Olufsen
Bell Canada
Bell Labs
Bell Telephone
Bell Telephone Manufacturing Company
Century Telephone Construction Co.
Charles Williams Jr. Shop
Chesapeake & Potomac Telephone
Chicago Telephone Supply
Clark Automatic Telephone
Connecticut Telephone
Cumberland Telephone
Dean Electric Telephone Co.
Deutsche Bundespost/Telekom
DeVeau Telephone
Dictograph Products
Electrical Engineering Co.
Electrical Goods Manufacturing Co.
Elektrisk Bureau
Eureka Electric
Farr Telephone
Federal Telephone & Telegraph Co.
General Post Office/BT
Gray Telephone Pay Station
GTE
H. Fuld & Co./TN
Holtzer-Cabot Electric Co.
Hose-McCann
ITT
Kellogg Switchboard and Supply
Keystone Telephone
Krone
L.M. Ericsson
Leich
Lincoln Telephone
Loeffler Phone Co.
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.
Phonemate Inc.
PTT/France Telecom
Roycroft Shops
S.H. Couch Co.
SAFNAT Milano
Schmidt & Bruckner Electric Co.
Screw Machine Products Co.
Shaver Telephone Co.
Siemens
Société Industrielle des Téléphones
Southern Bell
Southwestern Bell
Sterling Electric Co.
Stromberg-Carlson
Sumter Telephone Mfg. Co.
Swedish-American
Telequest
Televerket
Thomas A. Edison, Inc.
Tyco
Utica Fire Alarm Telegraph Co.
Viaduct Manufacturing
Victor Telephone
Western Electric
Western Telephone
Western Union
Wilhelm Telephone Mfg. (current)
Williams Telephone & Supply Co.
Williams-Abbott Electric Co.
Wisconsin Telephone
Wilhelm Telephone Mfg.
Founded in November 1898 in Buffalo, New York by Walter Wilhelm, an electrician who had been experimenting with telephone transmitters since 1894. The company's signature innovation was the Double Diaphragm transmitter, which used two separate chambers and diaphragms to improve sound quality, patented in 1896. Wilhelm produced candlestick telephones and potbelly desk sets with ornate nickeled brass fittings. He tried several times to sell his transmitter design to the Bell System but was turned down. The company ceased operations by 1913, one of many small independents unable to survive Bell's market consolidation.
