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发明名称
DIFFERENTIAL VENT AND BAR ACTUATED CIRCULATING VALVE
摘要
申请公布号
GB8322246(D0)
申请公布日期
1983.09.21
申请号
GB19830022246
申请日期
1983.08.18
申请人
VANN INC, GEO
发明人
分类号
E21B34/14;E21B37/08;E21B43/116;E21B43/119;(IPC1-7):E21B34/06
主分类号
E21B34/14
代理机构
代理人
主权项
地址
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