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发明名称
Commercial phonograph
摘要
申请公布号
US2259745(A)
申请公布日期
1941.10.21
申请号
US19390287692
申请日期
1939.08.01
申请人
DICTAPHONE CORPORATION
发明人
FRANZ FREDERICK
分类号
G11B25/04
主分类号
G11B25/04
代理机构
代理人
主权项
地址
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