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发明名称
VALVES
摘要
申请公布号
EP0216970(B1)
申请公布日期
1992.07.08
申请号
EP19850306676
申请日期
1985.09.19
申请人
AVA INTERNATIONAL CORPORATION
发明人
AKKERMAN, NEIL HOOVER
分类号
E21B34/06;E21B34/08
主分类号
E21B34/06
代理机构
代理人
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地址
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