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发明名称
Electromagnetic device
摘要
申请公布号
US1889000(A)
申请公布日期
1932.11.29
申请号
US19280298062
申请日期
1928.08.07
申请人
COLUMBIA PHONOGRAPH COMPANY, INC.
发明人
MITCHELL FRANK ALLEN
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
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地址
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