Plessey

Common card · No. 463337

The Plessey Company plc was a British electronics, defence and telecommunications company. It was listed on the London Stock Exchange and was a constituent of the FTSE 100 Index until it was acquired by GEC and Siemens in 1989. Plessey was established in 1917 with an initial focus on mechanical engineering; it diversified into electronics manufacturing in the 1920s, producing radios for Marconi and telephones for the General Post Office, along with various aircraft components during the 1930s. During the Second World War, Plessey's production capacity was used for the British war effort; it was during this time that it operated an underground factory in five miles of tunnels originally built for the London Underground. During the Cold War, the company expanded primarily via the acquisition of other companies as well as the formation of overseas subsidiaries. In 1961, Plessey merged with Ericsson Telephones and the Automatic Telephone Manufacturing Company to become the largest manufacturer...

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