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发明名称
Electromagnetic device
摘要
申请公布号
US2267808(A)
申请公布日期
1941.12.30
申请号
US19390296823
申请日期
1939.09.27
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BLOUNT NELSON
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
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