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发明名称
Verfahren zur Verbesserung der elektroakustischen Eigenschaften von Kohlemikrophonen durch chemische Nachbehandlung der am Mikrophoneffekt beteiligten Bauteile
摘要
申请公布号
DE1000448(B)
申请公布日期
1957.01.10
申请号
DE1955S046925
申请日期
1955.12.30
申请人
SIEMENS & HALSKE AKTIENGESELLSCHAFT
发明人
HUNGERMANN DR. RER. NAT. ERICH
分类号
H04R21/00
主分类号
H04R21/00
代理机构
代理人
主权项
地址
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