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发明名称
Sound radiator
摘要
申请公布号
US1821547(A)
申请公布日期
1931.09.01
申请号
US19250019746
申请日期
1925.03.31
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
HARTLEY RALPH V. L.
分类号
H04R7/00
主分类号
H04R7/00
代理机构
代理人
主权项
地址
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