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发明名称
DRILLING CROWN
摘要
申请公布号
SU1609939(A1)
申请公布日期
1990.11.30
申请号
SU19884603839
申请日期
1988.11.09
申请人
OTDEL EX ISSLEDOVANIJ TSNI GEOLOGORAZVEDOCHNOGO INSTITUTA
发明人
SUMANEEV NIKOLAJ N,SU;BUDYUKOV YURIJ E,SU;VOLKOV LEV L,SU
分类号
E21B10/48
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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