我院受沈阳自行车厂的委托,于一九八○年四月份开始研究不等壁管的制造,在八○年十一月试验成功,并决定设计,制造专用设备,目前专用设备正在制造。 Commissioned by the Shenyang Bicycle Factory, our hospital started to study the manufacture of unequal wall pipes in April 1980 and successfully tested in November 1980 and decided to design and manufacture special equipment that is currently being manufactured.