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发明名称
Verfahren und Vorrichtung zur telephonischen Überbrückung grosser Entfernungen.
摘要
申请公布号
CH140872(A)
申请公布日期
1930.06.30
申请号
CHD140872
申请日期
1929.05.15
申请人
DUMERMUTH,MARKUS,DR.
发明人
DUMERMUTH,MARKUS,DR.
分类号
H04M1/00
主分类号
H04M1/00
代理机构
代理人
主权项
地址
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