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我队在59年初，由于钻杆磨损严重，经常发生断钻具事故。后经修配厂同志们的努力，创造了一种多用母锥（可捞42及50毫米钻杆、68毫米钻铤及各种钻
My team in early 59, due to drill pipe wear and tear, often happen broken drill accident. After the repair factory comrades efforts to create a multi-purpose female cone (42 and 50 mm fishing rod, 68 mm drill collar and a variety of drilling