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发明名称
Loud speaker
摘要
申请公布号
US1924063(A)
申请公布日期
1933.08.22
申请号
US19310544057
申请日期
1931.06.13
申请人
CHAKIR MIDHAT
发明人
MIDHAT CHAKIR
分类号
H04R7/00
主分类号
H04R7/00
代理机构
代理人
主权项
地址
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