上海钢管厂革命工人遵照毛主席“独立自主、自力更生”的教导,和上海材料研究所、北京通用机械厂等协作单位的工人、革命技术人员和革命干部组成了一个磁针探伤“三结合”战斗小组。他们高举毛泽东思想伟大红旗,敢想、敢干、敢革命,从现场设计到生产试用,先后经过七十多次反复改进,终于制成我国第一台焊接钢管磁针探伤仪。这台探伤仪在生产中经受了三万六千多支钢管的探伤考验,并参加了十二万五千(?) According to Chairman Mao’s “independent, self-reliant” teaching, the revolutionary workers at the Shanghai Steel Pipe Plant formed a magnetic-needle-detection “three-in-one” combat team with workers from the cooperating units of Shanghai Materials Research Institute and Beijing General Machinery Factory, revolutionary technicians, and revolutionary cadres. They held high the great red flag of Mao Tse-tung’s thought, dared to think, dare to do it, and dared to revolutionize it. From on-site design to production trials, it had undergone more than 70 repeated improvements, and it finally became China’s first welded steel pipe magnetic needle flaw detector. This flaw detector suffered more than 36,000 steel pipe flaws in production and participated in 125,000 (?)