nanyang doer gas equipment co., ltd.-nanyang doer gas equipment co., ltd. is a joint-stock high-tech enterprise. the company is located in nanyang,a picturesque city,which is located in the north of han river,the south of funiu; the source of the south-to-north water diversion, the land of the military strategist zhuge liang, the famous qin chu "the battle of danyang" and the story of t