Chongqing Tongsheng Electrical & Mechanical Research Institute is a hi-and-new-tech enterprise professionally engaged in researching, designing and making oil filter. It is the co-operative unit for criteria making on State Operative Oil Standard with the certificate of BS EN ISO 9001:2000. It is the only one unit to obtain the production permit certificate for making Explosion-proof Oil Filter in China. And it enjoys the only one recognized certificate of Advanced-Level Enterprise in this Profession issued by the State Bureau of Technical Supervision.



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