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发明名称
Ear plug
摘要
申请公布号
US2850012(A)
申请公布日期
1958.09.02
申请号
US19570667007
申请日期
1957.06.20
申请人
MINE SAFETY APPLIANCES COMPANY
发明人
BECKER EARL M.
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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