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发明名称
Improvements in or relating to electrical signalling systems
摘要
申请公布号
GB496063(A)
申请公布日期
1938.11.24
申请号
GB19370015374
申请日期
1937.06.03
申请人
ERICSSON TELEPHONES LIMITED;FREDERICK LIMB
发明人
分类号
H04L12/18
主分类号
H04L12/18
代理机构
代理人
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