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![Rockwell scale - Wikipedia, the free encyclopedia](https://www.iarticlesnet.com/pub/img/site/s_07.jpeg)
Rockwell scale - Wikipedia, the free encyclopedia
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日期:2024-07-19
The differential depth hardness measurement was conceived in 1908 by a Viennese professor Paul Ludwik in his book ... Readings below HRC 20 are generally considered unreliable, as are readings much above HRB 100 ... ......看更多