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发明名称
Improvements in or relating to electrical signalling systems
摘要
申请公布号
GB716782(A)
申请公布日期
1954.10.13
申请号
GB19500000920
申请日期
1950.01.13
申请人
STANDARD TELEPHONES AND CABLES LIMITED
发明人
分类号
H03K17/74;H04J3/04;H04Q3/00
主分类号
H03K17/74
代理机构
代理人
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