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发明名称
ARRANGEMENT FOR MAINTAINING DRILLING MUD LEVEL IN A WELL
摘要
申请公布号
SU692976(A1)
申请公布日期
1979.10.25
申请号
SU19772515982
申请日期
1977.07.29
申请人
SHULGIN VOLF KH,SU;SHULGIN EVGENIJ V,SU;LEONTEV ALEKSANDR E,SU;SADIKOV YURIJ N,SU
发明人
SHULGIN VOLF KH,SU;SHULGIN EVGENIJ V,SU;LEONTEV ALEKSANDR E,SU;SADIKOV YURIJ N,SU
分类号
E21B21/00;(IPC1-7):E21B21/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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