由江苏工学院排灌机械研究所和镇江市减速机厂共同研制的ZS50—A轻型钻机,经过一年多的努力已于83年10月24日下午圆满通过部级鉴定。镇江市科委、镇江市 The ZS50-A light drilling rig co-developed by the Institute of Drainage and Irrigation Machinery of Jiangsu Polytechnic University and Zhenjiang City Reducer Factory passed the ministerial-level appraisal on the afternoon of October 24th, 83 after more than one year of hard work. Zhenjiang Science and Technology Commission, Zhenjiang City