Plessey Company, Cottenham Road, Ilford, United Kingdom.

Plessey is a British company specialised in the development and production of telecommunications equipment, military communications sets and other electronic applications.

Plessey was founded in 1917 in Marylebone near London by Th. Hodgson, C. Whitaker, Raymond and Plessey Parker; in 1919 the company moved to Cottenham Road and later to Vicarage Lane in Ilford. In the 1920s, Plessey manufactured the first radio receivers for Marconi and telephone equipment for the British Telephone Company. As the radio and television industry flourished, Plessey became one of the most important British manufacturers of telecommunications equipment in 1936 and also produced under licence. With the advent of the Second World War, Plessey produced equipment for the aviation industry, including the R-1155 receivers and T-1154 transmitters widely used in British bombers.

After merging with the British Ericsson Telephone Co., Plessey became one of the most important manufacturers of telephone equipment, later the group was split into Plessey Avionics & Communications, Plessey Radar and Plessey Marine. In 1988 Plessey Communications merged with GEC to form GEC - Plessey Communications and was acquired by Siemens.

• Plessey on the website of www.radiomuseum.org