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发明名称
Improvements relating to electric communication systems
摘要
申请公布号
GB540187(A)
申请公布日期
1941.10.08
申请号
GB19400010445
申请日期
1940.06.17
申请人
SIEMENS BROTHERS & CO. LIMITED;ABEL ROSEN
发明人
分类号
H04J1/16
主分类号
H04J1/16
代理机构
代理人
主权项
地址
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