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经营范围
发明名称
Ear horn
摘要
申请公布号
US1914734(A)
申请公布日期
1933.06.20
申请号
US19320603628
申请日期
1932.04.06
申请人
BUTTS EDMUND R
发明人
BUTTS EDMUND R.
分类号
A61F11/00
主分类号
A61F11/00
代理机构
代理人
主权项
地址
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