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发明名称
Telegraphieranlage mit periodischer automatischer Umschaltung der Verkehrsrichtung
摘要
申请公布号
DE513758(C)
申请公布日期
1930.12.03
申请号
DE1923E038109D
申请日期
1923.08.18
申请人
ELECTRICAL RESEARCH PRODUCTS, INC.
发明人
分类号
H04L5/18
主分类号
H04L5/18
代理机构
代理人
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地址
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