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a级显微维氏硬度测试块 【astm ilac 】
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guangzhou botech testing instrument co.,ltd
free hotline：400-990-6355
the phone：020-85206868
fax：020-85206868-808
e-mail：[email protected]
address: 709-711, building a, shengli science park, 257, junye road, east district, guangzhou economic and technological development zone.
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