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发明名称
Repeating device for talking machines
摘要
申请公布号
US1926580(A)
申请公布日期
1933.09.12
申请号
US19290367375
申请日期
1929.05.31
申请人
RADIO CORPORATION
发明人
CLARK GEORGE FREDERICK
分类号
G11B3/095
主分类号
G11B3/095
代理机构
代理人
主权项
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