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发明名称
Electrical signalling systems
摘要
申请公布号
US3230521(A)
申请公布日期
1966.01.18
申请号
US19620192036
申请日期
1962.05.01
申请人
BRITISH TELECOMMUNICATIONS RESEARCH LIMITED
发明人
DAVIS JOHN CHRISTOPHER HAMMOND
分类号
H03M1/00
主分类号
H03M1/00
代理机构
代理人
主权项
地址
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