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发明名称
DEVICE FOR ARRANGING ARTIFICIAL HOLE BOTTOM IN WELLS
摘要
申请公布号
SU878900(A1)
申请公布日期
1981.11.07
申请号
SU19792793623
申请日期
1979.07.09
申请人
LEZGIN LEONID A,SU;LAVROV VALERIJ A,SU;AJZENBERG VADIM B,SU
发明人
LEZGIN LEONID A,SU;LAVROV VALERIJ A,SU;AJZENBERG VADIM B,SU
分类号
E21B33/02;E21B7/08;(IPC1-7):E21B33/02
主分类号
E21B33/02
代理机构
代理人
主权项
地址
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