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发明名称
DEVICE FOR STEPPED DRILLING OF BOREHOLES
摘要
申请公布号
SU1615308(A1)
申请公布日期
1990.12.23
申请号
SU19884605479
申请日期
1988.10.04
申请人
VNI PK I PO OSUSHENIYU MESTOROZHDENIJ POLEZNYKH ISKOPAEMYKH, CüE|ôAóÓHÕM ×OPHÕM PA¬OTAM, PÔ¯HôÚHOö ×EOóO×ôô ô MAPKÛEö¯EPCKOMÔ ¯EóÔ
发明人
SELEZNEV NIKOLAJ A,SU
分类号
E21B7/28;E21D1/06
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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