Apparatus for periodically back flushing a well
作者： Joseph K Beckett
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摘要:
lens.org 参考文章(4)
Warren B Reed, Hydropneumatic pumping jack ,(1941)
James O Lewis, Well flowing apparatus ,(1940)
Howard Clapp William, Oil well pumping apparatus ,(1933)
Claude C Taylor, Oil well device ,(1936)