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发明名称
Unterwasser-Bohrlochkopf
摘要
申请公布号
DE1909872(B1)
申请公布日期
1970.10.22
申请号
DE19691909872
申请日期
1969.02.27
申请人
VETCO OFFSHORE IND INC
发明人
HUGHES NELSON BOBBY
分类号
E21B33/04;E21B33/043;(IPC1-7):E21B19/10
主分类号
E21B33/04
代理机构
代理人
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