Hydraulic pumping jack
作者： Mason John Conley
DOI:
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摘要:
lens.org 参考文章(5)
William E Moore, Furnace electrode regulator ,(1943)
Walter O Lum, Electroresponsive operating means ,(1927)
Clark John H, PUMPING SYSTEM FOR HYDROSTATIC APPARATUS. ,(1909)
Howard Clapp William, Oil well pumping apparatus ,(1933)
John H Suter, Hydraulic pump jack ,(1938)