heavy derrick meaning in Chinese

重吊杆装置
重型吊杆装置

Dongguang tool factory is the member of chinanese heavy derrick pulley association and the memberof cangzhou association of industy and commerce for the five metals . it was ste up 1970 . for thirty years we have been manufacturing and desing all kinds of derricks and slings . our products are welcome at home and abroad . we are given the fame : keeping promise and contract and fine interprise by hebei industry and commerce bureau
东光县工具厂是“中国重型机械其重滑车行业协会会员厂” ， “沧州工商联五金商会会员厂” ，建厂于一九七0 ，三十年来一直从业各种起重索具的设计和生产，产品服务于国内外市场，受到了国内外客户的好评，并被河北省工商局授予“重合同守信用”和“五好企业”称号。