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发明名称
METHOD FOR DRILLING ROCKS
摘要
申请公布号
SU1680922(A1)
申请公布日期
1991.09.30
申请号
SU19864155278
申请日期
1986.12.04
申请人
SVITALKA PETR,SU;RYBIN YURIJ S,SU
发明人
SVITALKA PETR I,SU;RYBIN YURIJ S,SU
分类号
E21B7/20
主分类号
E21B7/20
代理机构
代理人
主权项
地址
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