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经营范围
发明名称
BESKYTTELSESMUFFE FOR BORESTENGER.
摘要
申请公布号
NO782019(A)
申请公布日期
1979.09.21
申请号
NO19780002019
申请日期
1978.06.09
申请人
NIEMEYER GMBH, H.,
发明人
KREFT, GUENTER,
分类号
E21B17/10;(IPC1-7):E21B/
主分类号
E21B17/10
代理机构
代理人
主权项
地址
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