Name:  Certificate of ISO9002 Certificate No:  0500B0486 Date:  1994 Valid until:  2003-12-27 Range:  Production and Servicing of Synthetic diamonds,Synthetic Diamonds Tools,Hydraulic Props Reference:

Name:  Certificate of super-hard material(1) Certificate No:   Date:  2002 Valid until:   Range:   Reference:

Name:  Certificate of super-hard material(2) Certificate No:   Date:  2000 Valid until:   Range:   Reference:

Name:  Certificate of exhibiting brand of international exhibition Certificate No:   Date:  2002 Valid until:   Range:   Reference:

Name:  Certificate of recommended as high-quality product Certificate No:   Date:  2002 Valid until:   Range:   Reference: