black granite surface plategranite surface plate:Black granite surface accuracy please refer advanced leading countries standard platness tolerance grade 000=1*(1+d/1000)um gra
Granite Lathe BedBlack granite surface accuracy please refer advanced leading countries standard flatness to JB/T7975-1999 and JJG117-91 standard.We can provide our c
granite bed plategranite bed plate :1.for inspecting paralielism for work-pieces also for replacing the working blocks at the same height when required. 2.supplied in
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