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发明名称
Well head attachment for operating tools in a well under pressure
摘要
申请公布号
US2810439(A)
申请公布日期
1957.10.22
申请号
US19550507706
申请日期
1955.05.11
申请人
JOHNSON MCCULLOUGH OTIS;TOELKE LESTER W;MCCULLOUGH IRA J
发明人
MCCULLOUGH OTIS JOHNSON;TOELKE LESTER W.;MCCULLOUGH IRA J.
分类号
E21B33/072
主分类号
E21B33/072
代理机构
代理人
主权项
地址
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