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发明名称
Loud-speaker
摘要
申请公布号
US2347799(A)
申请公布日期
1944.05.02
申请号
US19410409598
申请日期
1941.09.05
申请人
ALEXANDER SCHAAF
发明人
SCHAAF ALEXANDER
分类号
H04R9/06
主分类号
H04R9/06
代理机构
代理人
主权项
地址
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