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发明名称
Verfahren zur akustischen Signalgebung in bestimmter Richtung
摘要
申请公布号
DE608568(C)
申请公布日期
1935.01.26
申请号
DE1934W093815D
申请日期
1934.03.06
申请人
DR. HANS WALTHER
发明人
分类号
G08B3/14
主分类号
G08B3/14
代理机构
代理人
主权项
地址
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