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发明名称
STOETDEMPER FOR DYPBORINGSSTRENG.
摘要
申请公布号
NO146550(C)
申请公布日期
1982.10.20
申请号
NO19770001153
申请日期
1977.03.31
申请人
CHRISTENSEN, INC.,
发明人
JURGENS, RAINER,
分类号
E21B17/07;(IPC1-7):E21B17/07;F16D3/06
主分类号
E21B17/07
代理机构
代理人
主权项
地址
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