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发明名称
Vorrichtung zum doppelseitigen Hoeren an Mikrotelefonen
摘要
申请公布号
DE520468(C)
申请公布日期
1931.03.11
申请号
DENDATO017828D
申请日期
申请人
DR.-ING. HANS ODENWALD
发明人
分类号
H04R1/10
主分类号
H04R1/10
代理机构
代理人
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地址
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