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发明名称
LINE RELAY FOR D.C. TELEGRAPH SYSTEMS
摘要
申请公布号
CA903096(A)
申请公布日期
1972.06.20
申请号
CAD903096
申请日期
申请人
WALTER J. ZENNER
发明人
WALTER J. ZENNER
分类号
H04L25/02;H04L25/24;(IPC1-7):H04L25/02
主分类号
H04L25/02
代理机构
代理人
主权项
地址
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