Its roots were in the Wireless Telegraph & Signal Company, which underwent several changes in name after mergers and acquisitions.

The company and factory was moved to New Street Works in 1912 to allow for production expansion in light of the RMS Titanic disaster.

Along with private entrepreneurs, Marconi company formed in 1924 the Unione Radiofonica Italiana (URI), which was granted by Mussolini's regime a monopoly of radio broadcasts in 1924.

After leaving Marconi in 1928 he went on to lead research at EMI where he was influential in the development of television broadcasting.

At this time the Marconi Company had facilities at New Street Chelmsford, Baddow, Basildon, Billericay, and Writtle as well as in Wembley, Gateshead and Hackbridge.

Acquisitions which were folded into the company and partnerships established included: Other acquisitions included: In a major reorganisation of the company, GEC-Marconi was renamed Marconi Electronic Systems in 1996 and was separated from other non-defence assets.

BAE were granted limited rights to continue use of the Marconi name in existing partnerships, which had ceased by 2005.

[8] The remainder of the Marconi company, with some 2,000 staff working on telecommunications infrastructure in the UK and the Republic of Ireland, was renamed Telent.