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发明名称
Air Admittance valve for resisting high internal pressure
摘要
申请公布号
USRE35532(E1)
申请公布日期
1997.06.17
申请号
US08/360402
申请日期
1994.12.21
申请人
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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