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发明名称
Loud-speaker
摘要
申请公布号
US1775453(A)
申请公布日期
1930.09.09
申请号
US19250034329
申请日期
1925.06.02
申请人
INTERNATIONAL ACOUSTIGRAPH COMPANY
发明人
FOLEY EARL H.
分类号
H04R1/24;H04R1/28
主分类号
H04R1/24
代理机构
代理人
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