1975年7月,在毛主席无产阶级革命路线指引下,贵阳钢铁厂来我们梅山铁矿采矿场进行22毫米六角成品钎杆的工业试验。一年来的试验结果证明,这种成品钎杆质量较好,使用寿命长。现在,我矿平巷掘进用的钎杆,全部由自制钎杆改用贵阳钢铁厂生产的成品钎杆。锻钎班的任务主要是返修失效了的成品钎杆。在贵阳钢铁厂的大力帮助下,我们改进了工艺和 In July 1975, under the guidance of Chairman Mao’s proletarian revolutionary line, Guiyang Iron and Steel Factory came to our industrial test at the Meishan Iron Mine to conduct a 22 mm hexagonal finished rod drill. Test results over the past year proved that this finished rod quality better, long service life. Now, mine mine drifting with the drill rod, all from the homemade drill rod to Guiyang steel plant finished rod. The main task of forging drill classes is to repair the finished rod that has failed. With the great help of Guiyang Iron and Steel Plant, we have improved the process and technology