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发明名称
Anordnung zur Signalgabe in Fernsprechanlagen mittels Wechselstroeme im Bereiche der Sprachfrequenzen
摘要
申请公布号
DE575687(C)
申请公布日期
1933.05.02
申请号
DED575687D
申请日期
1930.09.19
申请人
SIEMENS & HALSKE AKT.-GES.
发明人
GILLER VIKTOR
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
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