On Nov. 09, 2015, representative of Bureau Veritas (BV) came to Puyang Zhongshi Group for on-site audit and issued us a certificate for the following four aspects:
1. Company basic details,  including organization structure, staff structure and number, etc.
2. Company qualification, including business license, tax registration certificate, API certificates, ISO certificates, National Industrial Production License, etc.
3. Production capacity, including production facilities, production process, quality control, etc.
4. Key products, including casing centralizers, float collars & shoes, cementing plugs, cementing heads, stage cementing collars, sucker rod pumps, pumping units, etc.