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Beijing Longknow Environmental        

         Protection Technology Co., Ltd.           

             

           Add：Rm. 156, Building B, No.18, South Rd of West Ring in Beijing Economy 
development zone , Beijing 100176, P. R. China
           Tel：0086-10-68040107          
           Fax：0086-10-68054207
           E-mail: purity@longknow.com
                         langnuo@sohu.com
                         langnuo2008@sina.com

 

  

 

 

 

 

 

 

 

©Copyright ［Beijing Longknow Environmental Protection Technology Co., Ltd.］
 Rm. 156, Building B, No.18, South Rd of West Ring in Beijing Economy development zone , Beijing 100176, P. R .China

Telephone： 0086-10-68040107   Fax: 0086-10-68054207