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发明名称
BOREHOLE DRILLING DEVICE
摘要
申请公布号
SU1609934(A1)
申请公布日期
1990.11.30
申请号
SU19884628460
申请日期
1988.12.30
申请人
GOJ VLADIMIR L
发明人
GOJ VLADIMIR L,SU
分类号
E21B7/24
主分类号
E21B7/24
代理机构
代理人
主权项
地址
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