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发明名称
FREMGANGSMAATE VED BORING AV EN UNDERVANNSBROENN OG STIGEROER FOR BRUK VED SLIK BORING
摘要
申请公布号
NO153115(B)
申请公布日期
1985.10.07
申请号
NO19770003168
申请日期
1977.09.14
申请人
STANDARD OIL COMP,
发明人
HALL, JOHNCE E.,;WALLER, MICHAEL R.,;GREENFIELD, WILLIAM D.,
分类号
E21B7/128;E21B17/01;E21B21/00;E21B21/08;(IPC1-7):E21B17/01
主分类号
E21B7/128
代理机构
代理人
主权项
地址
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