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经营范围
发明名称
WELL FLUSHING DEVICE
摘要
申请公布号
SU1627657(A1)
申请公布日期
1991.02.15
申请号
SU19884396716
申请日期
1988.03.25
申请人
KOVALENKO YURIJ,SU
发明人
KOVALENKO YURIJ I,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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