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发明名称
Overshot grab fishing tool for oil wells
摘要
申请公布号
US2502567(A)
申请公布日期
1950.04.04
申请号
US19480052801
申请日期
1948.10.05
申请人
HOWARD CLIFFORD M
发明人
HOWARD CLIFFORD M.
分类号
E21B31/18
主分类号
E21B31/18
代理机构
代理人
主权项
地址
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