witness mark n.— «Development of a material cutting machine employing an ultrasonic cutting blade that is three times faster than earlier methods. The same equipment automatically marks the material with either witness mark lines or part...
witness mark n.— «Witness marks on the jack screws that drive the flaps and on other data indicate that Flight 801’s flaps had been placed in the landing setting of 30 deg., according to investigators.» —“Guam Probe Targets Weather...