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发明名称
Loud speaker
摘要
申请公布号
US1815944(A)
申请公布日期
1931.07.28
申请号
US19250057425
申请日期
1925.09.19
申请人
HOPKINS CORPORATION
发明人
GUMAER PERCY W.
分类号
H04R7/06
主分类号
H04R7/06
代理机构
代理人
主权项
地址
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