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发明名称
Publicity apparatus
摘要
申请公布号
US1842895(A)
申请公布日期
1932.01.26
申请号
US19300436413
申请日期
1930.03.17
申请人
CHADWICK WILLIAM H
发明人
CHADWICK WILLIAM H.
分类号
H04R27/00
主分类号
H04R27/00
代理机构
代理人
主权项
地址
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