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发明名称
Apparatus for lowering and elevating tools in well bores
摘要
申请公布号
US2776012(A)
申请公布日期
1957.01.01
申请号
US19540460116
申请日期
1954.10.04
申请人
BAKER OIL TOOLS, INC.
发明人
BAKER REUBEN C.
分类号
E21B23/06
主分类号
E21B23/06
代理机构
代理人
主权项
地址
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