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发明名称
A flapper valve assembly
摘要
申请公布号
GB2473671(A)
申请公布日期
2011.03.23
申请号
GB20090016626
申请日期
2009.09.22
申请人
REEVES WIRELINE TECHNOLOGIES LIMITED
发明人
SIMON CHRISTOPHER ASH;MICHAEL JOHN CHAPLIN
分类号
E21B34/14;E21B34/00;E21B34/06
主分类号
E21B34/14
代理机构
代理人
主权项
地址
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