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发明名称
DERRICK
摘要
申请公布号
GB2155520(A)
申请公布日期
1985.09.25
申请号
GB19840031251
申请日期
1984.12.11
申请人
* O T C A/S
发明人
ROGER C * SWISHER;JENS OLAV * FLOBAK;BJORN * EILERTSEN;NIKOLAI * JAKOBSEN;JONNY * GABREILSEN
分类号
E21B15/02;E21B19/00;(IPC1-7):E21B15/02
主分类号
E21B15/02
代理机构
代理人
主权项
地址
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