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发明名称
RUECKSCHLAGVENTILANORDNUNG ZUR VERWENDUNG IN EINEM BOHRLOCH
摘要
申请公布号
DE3107886(A1)
申请公布日期
1982.01.07
申请号
DE19813107886
申请日期
1981.03.02
申请人
HALLIBURTON CO.
发明人
CHRIS ZIMMERMAN,JOHN
分类号
E21B33/129;E21B34/06;E21B34/10;E21B49/00;(IPC1-7):E21B34/06
主分类号
E21B33/129
代理机构
代理人
主权项
地址
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