Apparatus for drilling holes in underground formations

申请公布号：GB879415(A)

申请号：GB19600024743

申请日期：1960.07.15

申请公布日期：1961.10.11

申请人：

SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V.

分类号：E21B10/23;E21B10/24

主分类号：E21B10/23

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