Thomson Marconi Sonar or TMS was formed in 1996 by the merger of the sonar systems businesses of French defence electronics specialist Thomson-CSF and British company GEC-Marconi after the payment of a balance by the latter.
[2] Denis Ranque was appointed as its CEO.
The new company would head 3 operational entities: With the merger of GEC's defence business Marconi Electronic Systems and British Aerospace in 1999, the resulting BAE Systems acquired Marconi's 49.9% share in TMS.
BAE, through an options agreement, forced Thomson-CSF (now called Thales) to purchase its stake in 2001.
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