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发明名称
Retrievable drilling apparatus for bore holes
摘要
申请公布号
US3074494(A)
申请公布日期
1963.01.22
申请号
US19590835636
申请日期
1959.08.24
申请人
KAMMERER;JEAN K. LAMPHERER;ARCHER W. KAMMERER, JR.
发明人
KAMMERER ARCHER W.
分类号
E21B10/34;E21B10/66
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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