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发明名称
Anordnung zur Verbesserung der Speisung des Mikrophons vom Amt weit entfernter Fernsprechapparate
摘要
申请公布号
DE635439(C)
申请公布日期
1936.09.17
申请号
DENDATG085803D
申请日期
申请人
DR. MARTIN GRUETZMACHER
发明人
分类号
H04M19/08
主分类号
H04M19/08
代理机构
代理人
主权项
地址
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