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经营范围
发明名称
DRILLING RIG
摘要
申请公布号
SU923377(A3)
申请公布日期
1982.04.23
申请号
SU19752123714
申请日期
1975.04.10
申请人
LINDEN-ALIMAK AB (INOFIRMA)
发明人
SVEN GRANKHOLM,SE
分类号
E21B6/04;(IPC1-7):E21C1/00
主分类号
E21B6/04
代理机构
代理人
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地址
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