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Ada, 1980.

• crag 13y ago
  1975 (ok, release was 1977). Was in active development/production work in 1977. The DOD standardized on Ada in 1986 (I think). I was in the Army then writing Ada (and using Wang - remember Wang?). Ada is still in use today. Besides the military, there are a lot of "mission critical" systems written in Ada.