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发明名称
APPARATUS FOR DRILLING WELLS
摘要
申请公布号
SU1601326(A1)
申请公布日期
1990.10.23
申请号
SU19884484062
申请日期
1988.09.20
申请人
ZAGARENKO ELENA A,SU
发明人
ZAGARENKO ELENA A,SU
分类号
E21B21/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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