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发明名称
Locked drilling safety joint
摘要
申请公布号
US2039945(A)
申请公布日期
1936.05.05
申请号
US19350029208
申请日期
1935.07.01
申请人
WICKERSHAM HARRY P;CRAIG HARLEY J
发明人
WICKERSHAM HARRY P.;CRAIG HARLEY J.
分类号
E21B17/06
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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