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山东省青岛市自来水公司的革命职工,遵照伟大领袖毛主席“独立自主、自力更生”的教导,发扬敢想、敢干的革命精神,试制成功直径800毫米地下管道水泥砂浆衬里
The revolutionary workers of the Qingdao Water Supply Company in Shandong Province followed the guidance of the great leader Chairman Mao’s “independent, self-reliant,” and carried forward the revolutionary spirit of daring to think and dare to do a trial of a successful cement mortar lining with an underground diameter of 800 mm.