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 numbers using an ink-jet process.» —“B-2 Bomber Development New Design, Production Tools Will Play Key Role in B-2 Cost” in Los Angeles Aviation Week & Space Technology Dec. 5, 1988. (source: Double-Tongued Dictionary)
Further reading
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