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发明名称
Loud speaker
摘要
申请公布号
US1829910(A)
申请公布日期
1931.11.03
申请号
US19300442430
申请日期
1930.04.07
申请人
CHAKIR MIDHAT
发明人
MIDHAT CHAKIR
分类号
H04R7/00
主分类号
H04R7/00
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