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Note: This is a sub-section of GEC
WWI GEC's military products included radios and light bulbs.
WWII the company was involved in many important technological advances, most notably radar.
Between 1945 and GEC's demerger of its defence business in 1999, the company became one of the world's most important defence contractors.
1955 Established a new applied electronics laboratories at Stanmore to create a defence electronics capability, initially centred on developing missile guidance systems for the Royal Navy.
1968 After GEC's acquisition of English Electric Co, GEC-Marconi was formed to manage the defence related businesses, including Elliott Space and Weapons Automation at Borehamwood.
The Marconi brand was used for GEC's defence businesses e.g. Marconi Space & Defence Systems (MSDS), Marconi Underwater Systems Ltd (MUSL).
1969 GEC reorganised the businesses it had acquired from Elliott Automation, English Electric Co, AEI and Marconi. GEC-Marconi Electronics was created with 4 subsidiaries Marconi-Elliott Avionics Systems Limited, GEC-Elliott Space and Weapons Systems, Marconi Communications Systems and Marconi Radar Systems .
Marconi Radar Systems Ltd was formed from GEC-AEI Electronics (Blackbird Road and New Parks, Leicester), Marconi's Radar Division (Chelmsford) and Elliott's Aerospace Control Division.
1978 Marconi-Elliott Avionics Systems was renamed Marconi Avionics Limited.
On 18th March 1996 Mr Simpson was confirmed as managing director of GEC as replacement for Lord Weinstock. In reporting the appointment The Independent said "some analysts believe that Mr Simpson's inside knowledge of BAe, a long-rumoured GEC bid target, was a key to his appointment. GEC favours forging a national 'champion' defence group with BAe to compete with the giant US organisations."
1998 GEC acquired Tracor, a major American defence contractor, for $1.4bn.
1999 January: a proposal was made to demerge GEC's defence businesses, Marconi Electronic Systems, and merge them with British Aerospace (BAe) to form BAE Systems. This transaction was completed on 29 November 1999. GEC then renamed itself Marconi plc.
2003 BAE Systems split its ship and submarine building operations - the VSEL unit became an independent division known as BAE Systems Submarines. This was renamed BAE Systems Submarine Solutions in January 2007.