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发明名称
SPEECH TRANSMISSION
摘要
申请公布号
IE13128(L)
申请公布日期
1932.08.28
申请号
IED13128
申请日期
1932.02.25
申请人
SIEMENS AND HALSKE AG
发明人
分类号
H04B3/28;(IPC1-7):H04B3/28
主分类号
H04B3/28
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