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发明名称
Mit einem Kohlemikrophon betriebenes Schwerhoerigengeraet
摘要
申请公布号
DE887214(C)
申请公布日期
1953.08.20
申请号
DE1948P009904
申请日期
1948.10.02
申请人
ATLAS-WERKE A. G.
发明人
GRANDJOT WALTER DR.
分类号
H04R1/04;H04R25/04
主分类号
H04R1/04
代理机构
代理人
主权项
地址
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