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BAeSEMA acquired Dowty-Sema in 1992, another naval systems joint venture between Dowty Group and Sema.
- Naval combat management systems
- Warship prime contracting
From BAe's perspective BAeSEMA was an attempt to increase its capabilities as a naval prime contractor. This was not entirely successful for two reasons:
- A customer was more likely to choose a prime contractor with shipbuilding experience and capabilities.
- Another shipbuilder was unwilling to team with the company because as prime contractor BAeSEMA would effectively control that shipbuilder.
On November 11, 1998 BAe acquired Sema's interest in the company for £77 million and merged it into British Aerospace Defence Ltd. BAe's naval capabilities increased dramatically in the next year, its acquisition of Marconi Electronic Systems to form BAE Systems saw it take control of Marconi Marine's shipyards; VSEL (Barrow-in-Furness), Govan (Glasgow) and YSL (Scotstoun).