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发明名称
Schaltungsanordnung fuer Tonfrequenzteilnehmertelegraphie ueber Fernsprechvermittlungsanlagen
摘要
申请公布号
DE669216(C)
申请公布日期
1938.12.21
申请号
DED669216
申请日期
1930.06.26
申请人
DIPL.-ING. ROMAN KOLL
发明人
分类号
H04M11/06
主分类号
H04M11/06
代理机构
代理人
主权项
地址
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