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发明名称
VENTIL
摘要
申请公布号
DK425285(A)
申请公布日期
1987.03.20
申请号
DK19850004252
申请日期
1985.09.19
申请人
AVA INTERNATIONAL CORPORATION
发明人
AKKERMAN NEIL HOOVER
分类号
E21B;(IPC1-7):E21B/
主分类号
E21B
代理机构
代理人
主权项
地址
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