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发明名称
DRILLING MUD-EXPANDABLE STRUCTURE
摘要
申请公布号
SU717284(A1)
申请公布日期
1980.02.25
申请号
SU19752174331
申请日期
1975.09.09
申请人
ALEKHIN STANISLAV A,SU;KIPNIS SERGEJ G,SU
发明人
ALEKHIN STANISLAV A,SU;KIPNIS SERGEJ G,SU
分类号
E21B33/12;E21B33/138;(IPC1-7):E21B33/13
主分类号
E21B33/12
代理机构
代理人
主权项
地址
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