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Part of Plessey Co
1987/8 Aerospace and engineering accounted for 8 per cent of Plessey's turnover. The principal activities were microwave materials for `stealth applications, systems and components for civil and military aircraft, electrical power units for tanks and fighting vehicles, product support services, and plastics.
Microelectronics and components accounted for 9 per cent of turnover . Major activities were silicon integrated circuits (bi-polar and metal-oxide silicon), gallium arsenide products and opto-electronics.
by 1989 this area consisted of the following businesses: