Combelock Limited | 13th August 1979 to 31st December 1979 |
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Wing Systems Limited | 31st December 1979 to 31st December 1981 |
Applied System Techniques (Midland) Limited | 31st December 1981 to 20th September 1984 |
Wing Systems Limited | 20th September 1984 to 12th November 1984 |
Advanced Program Base Limited | 12th November 1984 to 30th April 2013 |