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发明名称
Drilling safety joint
摘要
申请公布号
US2049290(A)
申请公布日期
1936.07.28
申请号
US19350026890
申请日期
1935.06.17
申请人
LAWRENCE P. BAASH
发明人
BURNS ERWIN;WICKERSHAM HARRY P.
分类号
E21B17/06;F16L37/252
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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