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Made according to standard JB/T7977-99, material HT250, Workingsurface made by skiving, Used to test the straightness and flatnessof workpiece. Working environment temperature (20 ± 5) ???

Made according to standard JB/T7977-99, material HT250, Workingsurface made by skiving, Used to test the straightness and flatnessof workpiece. Working environment temperature (20 ± 5) ???



