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发明名称
Ear protector valve
摘要
申请公布号
US2458884(A)
申请公布日期
1949.01.11
申请号
US19460638881
申请日期
1946.01.03
申请人
JOHN VOLKMANN
发明人
VOLKMANN JOHN
分类号
A61F11/08
主分类号
A61F11/08
代理机构
代理人
主权项
地址
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