Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 147,385 pages of information and 233,518 images on early companies, their products and the people who designed and built them.
1920 Recognising the interdependence of effective braking and signalling in train safety, the Westinghouse Brake Co acquired certain assets of the Consolidated Signal Co. By these means, Westinghouse Brake secured controlling interests in the signal manufacturing concerns of:
The name of the company was changed to Westinghouse Brake and Saxby Signal Co.
1925 Introduced metal rectifiers, not long after the discovery that Copper Oxide could act as a rectifying medium.
1926 Appointed Millemon (Factors) as sales service and fitting agents for the Fife, Kinross, Clackmannan, Linlithgow, Berwick, Roxborough, Selkirk, Peebles, Stirling, east of and including Falkirk areas of Scotland.
1929 British Industries Fair Adverts for Low Tension Battery Eliminator and Metal Rectifiers. Manufacturers of All-metal Rectifiers for use in Radio apparatus and Battery Chargers, and for other purposes, where direct current is required from alternating current supply. (Wireless section - Stand No. MM.39). [of York Road, London] 
1935 The company name was changed to the Westinghouse Brake and Signal Co