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发明名称
Loud-speaker horn
摘要
申请公布号
US1763381(A)
申请公布日期
1930.06.10
申请号
US19250055889
申请日期
1925.09.12
申请人
RADIO CORPORATION
发明人
DYCK ARTHUR F. VAN;GUBER FREDERICK H.
分类号
G10K11/02
主分类号
G10K11/02
代理机构
代理人
主权项
地址
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