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- American Brake Company
- Bergmann Electric Werke, A.G.
- British Westinghouse Electric & Manufacturing Company
- Bryant Electric Company
- Canadian Concrete Products Company, Limited
- Canadian Westinghouse Company, Limited
- Cie. Int. Pr. Le Chauf’ge Des Chem’s De Fer Systeme Heintz,
Limited
- Clyde Valley Electric Power Company, Limited
- Comp. Pour Les Applications Des Rayons Ultra-Violet (France)
- Compagnia Italiana Westinghouse Dei Freni
- Compagnie Des Freins Westinghouse
- Compagnie Des Lampes A Filaments Metalliques
- Consolidated Electric Light Company
- Cooper Hewitt Electric Company
- Copeman Electric Stove Company
- East Pittsburgh Improvement Company
- East Pittsburgh & Wilmerding Coal Company
- Electric Properties Corporation
- Electro-Magnetic Traction Company
- Emery Pneumatic Lubricator Company
- Fountain Electrical Floor Box Corporation
- Franklin Electric Manufacturing Company
- French Westinghouse Electric Company
- Fuel Gas and Electrical Engineering Company
- George Cutter Company
- Interborough Improvement Company
- International Radio Telegraph Company, The
- J. Stevens Arms Company
- Krantz Manufacturing Company, Incorporated
- Laurentide Mica Company, Limited
- Locomotive Stoker Company
- Manhattan General Construction Company
- Mansfield Vitreous Enameling Company, The
- McCandless Lamp Company
- McKenzie-Holland & Westinghouse Power Signal Company,
Limited
- Meriden Fire Arms Company
- Milwaukee Locomotive Manufacturing Company
- National Brake & Electric Company
- National Steel Foundries
- National Utilities Corporation
- Nernst Lamp Company
- New England Westinghouse Company
- Page-Storm Drop Forge Company
- Perkins Electric Switch Manufacturing Company
- Philadelphia Company
- Pittsburgh High Voltage Insulator Company
- Pittsburgh Meter Company
- R.D. Nuttall Company
-
Safety Appliance Company founded
- Sawyer-Man Electric Company
- Security Investment Company
- Soc. Int. Pour Les Applications Des Rayons Ultra-Violet
(Belgium)
- Societa Italiana Westinghouse
- Societe Anonyme Pr. L’Exploitation Des Procedes Westinghouse
Leblanc
- Societe Anonyme Westinghouse (France)
- Societe Anonyme Westinghouse (Russia)
- Societe Electrique Westinghouse De Russie
- Societe Hongroise D’Auto Systeme Westinghouse
- South Philadelphia Company
- Standard Car Heating & Ventilating Company
- Standard Underground Cable Company
- Traction & Power Securities Company
- Trafford Real Estate Company
- Trafford Water Company
- Turtle Creek & Allegheny Valley Railroad Company
- Union Switch & Signal
- United Electric Light & Power Company
- United Pump & Power Company
- Walker Electric Company
- Waterhouse Electric Company
- Westinghouse Air Brake Company
- Westinghouse Air Brake Home Building Company
- Westinghouse Air Spring Company
- Westinghouse Automatic Air & Steam Coupler Company
- Westinghouse Automotive Air Brake
- Westinghouse Brake Company, Limited
- Westinghouse Brake Company, Limited (Australasia)
- Westinghouse Brake & Saxby Signal Company, Limited
- Westinghouse Bremsen Gesellschaft
- Westinghouse, Church, Kerr & Company
- Westinghouse Company (Schenectady)
- Westinghouse Cooper Hewitt Company, Limited
- Westinghouse Electric Company
- Westinghouse Electric Company, Limited
- Westinghouse Electric Export Company
- Westinghouse Electric International Company (WEICO)
- Westinghouse Electric & Manufacturing Company
- Westinghouse Electric Products Company
- Westinghouse Elektricitaets-Gesellschaft
- Westinghouse European Brake Company
- Westinghouse Foundry Company
- Westinghouse Friction Draft Gear Company
- Westinghouse Gear & Dynamometer Company
- Westinghouse Glass Company
- Westinghouse Interworks Railway Company
- Westinghouse Lamp Company
- Westinghouse Machine Company
- Westinghouse Metal Filament Lamp Company
- Westinghouse Metallfaden Gluhlampenfabrik Gesellschaft
- Westinghouse Norsk Elektrisk Aktienselskap
- Westinghouse Pacific Coast Brake Company
- Westinghouse Patent Bureau (London)
- Westinghouse Traction Brake Company
- Westinghouse Union Battery Company
- World’s Fair Equipment Company
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