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发明名称
Terminal collar for well casings
摘要
申请公布号
US2034698(A)
申请公布日期
1936.03.24
申请号
US19330674328
申请日期
1933.06.05
申请人
HILD FREDERIC W
发明人
HILD FREDERIC W.
分类号
E21B33/04;E21B33/06
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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