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发明名称
Schaltungsanordnung fuer Nullfrequenzruf und -wahl
摘要
申请公布号
DE812933(C)
申请公布日期
1951.09.06
申请号
DE1949P040774
申请日期
1949.04.26
申请人
SIEMENS & HALSKE A. G.
发明人
FREYSTEDT ERICH DIPL.-ING. DR.
分类号
H04J1/14;H04Q1/442
主分类号
H04J1/14
代理机构
代理人
主权项
地址
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