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1991年5月18日机械电子工业部以机电科标[1991]849号文批准,发布的凿岩机械气动工具行业标准如下:
On May 18, 1991, the Ministry of Machinery and Electronic Industry approved the electromechanical standard [1991] No. 849 document and released the industrial standards for pneumatic tools for rock drilling machinery as follows: