Beijing Marketing Office is a commercial center of both Great Wall Bio-Chemical Engineering Co., Ltd(GW) and Yantai Taroke Bio-engineering Co., Ltd(YT).Specilizing in the constitution of marketing strategies, the implementation of business procedures and after-sales services worldwide.The Great Wall Bio-Chemical Engineering Co., Ltd (www.greatwall-biochem.com) was set up in 1998 and committed to the research, manufacture and sales of natural tartaric acid and their salts.To meet the increasing demands for the mentioned products, its sister company: Yantai Taroke Bio-engineering Co., Ltd(www.taroke.com) was established which produces tartaric acid synthesized in 2008,. its production capacity reaches to 6000Ts per year. Beijing Marketing Office focus on both home and overseas customers and markets and aims at building a leading supplier of tartaric acids with its good quality, competitive price and best service.