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经营范围
发明名称
METHOD FOR DRILLING ROCKS OF ALTERNATING HARDNESS
摘要
申请公布号
SU1747666(A1)
申请公布日期
1992.07.15
申请号
SU19894768912
申请日期
1989.10.23
申请人
MO I NEFTI GAZA IM.I.M.GUBKINA
发明人
PALASHCHENKO YURIJ A,SU
分类号
E21B10/18
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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