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发明名称
Elektroakustische Umformungseinheit
摘要
申请公布号
DE825998(C)
申请公布日期
1951.12.27
申请号
DE1948P022265D
申请日期
1948.11.21
申请人
PAUL BEERWALD
发明人
BEERWALD PAUL
分类号
H04R17/00
主分类号
H04R17/00
代理机构
代理人
主权项
地址
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