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There is a page named "File:Rockwell hardness tester closeup 001.jpg" on Wikipedia
DescriptionRockwell hardness tester closeup 001.jpg A closeup of the business end of a Rockwell-type hardness tester. Date 2010 Source Own work Author...(3,000 × 4,000 (4 MB)) - 11:20, 14 June 2022
