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发明名称
UEbertragungsverfahren fuer Tonfrequenz-Wahlzeichen
摘要
申请公布号
DE839949(C)
申请公布日期
1952.05.26
申请号
DE1949P041942D
申请日期
1949.05.07
申请人
MIX & GENEST AKTIENGESELLSCHAFT, STUTTGART-ZUFFENHAUSEN
发明人
STUTTGART-ZUFFENHAUSEN DR. MARTIN JAENKE,
分类号
H04Q1/45
主分类号
H04Q1/45
代理机构
代理人
主权项
地址
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