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发明名称
HOLE BOTTOM VALVE FOR ACTING URON THE HOLE BOTTOM AREA OF A WELL
摘要
申请公布号
SU832074(A1)
申请公布日期
1981.05.23
申请号
SU19772536420
申请日期
1977.10.20
申请人
SIBIRSKIJ NII NEFTYANOJ PROMYSHLENNOSTI
发明人
AFANASEV VLADIMIR A,SU;ZHURAVLEV VIKTOR S,SU;KONDRATEV GENNADIJ I,SU;KHAPUGIN VALERIJ S,SU;SHARONOV VALERIJ V,SU
分类号
E21B34/10;E21B43/25;(IPC1-7):E21B43/25
主分类号
E21B34/10
代理机构
代理人
主权项
地址
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