16th Numerical Control Society annual meeting & technical conference, March 25-28,1979. 15th Numerical Control Society annual meeting & technical conference, Chicago, April 9-12, 1978. Proceedings of 17th numerical control society annual meeting & technical conference. Proceedings of 19th numerical control society annual meeting and technical conference. Proceedings of 20th numerical control society annual meeting and technical conference. Proceedings of ... Numerical Control Society annual meeting & technical conference Proceedings of Numerical Control Society, ... annual meeting and technical conference.