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    Manufacturing base:
    NO. 16, Guangtong Road, Longquan Town, Zichuan District, Zibo City, Shandong, China
    Oversea Sales:
    Tel: 86-532-86959667 Fax: 86-532-86760085
    E-mail: sales@changyuintl.com
    Domestic Sales:
    Tel: 86-533-5860002、86-533-5860039 Fax: 86-533-5860296
    E-mail: gtsales@changyuintl.com
    Branch
     Qingdao Guangtong Biotechnology Development Co., Ltd.

    Qingdao Guangtong Biotechnology Development Co., Ltd is a biotechnology company located in No. 27, London Road, QingdaoFree Trade Zone. The company was invested by Zibo Guangtong Chemical Co., Ltd in 2002. With strong researching, manufacturing and marketing ability, the company mainly focuses on researching, producing and marketing of long chain dicarboxylic acids and its downstream products. 

     
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