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发明名称
EARTH-DRILLING TOOL
摘要
申请公布号
SU846710(A1)
申请公布日期
1981.07.15
申请号
SU19792834769
申请日期
1979.10.30
申请人
GOJ VLADIMIR L,SU
发明人
GOJ VLADIMIR L,SU
分类号
E21B10/34;(IPC1-7):E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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