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发明名称
Loud speaker
摘要
申请公布号
US1951692(A)
申请公布日期
1934.03.20
申请号
US19330665810
申请日期
1933.04.12
申请人
EVENS ALBERT M
发明人
EVENS ALBERT M.
分类号
H04R1/24
主分类号
H04R1/24
代理机构
代理人
主权项
地址
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