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发明名称
Improvements in or relating to electrical signalling systems
摘要
申请公布号
GB366597(A)
申请公布日期
1932.02.08
申请号
GB19300033582
申请日期
1930.11.07
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
G08B5/22
主分类号
G08B5/22
代理机构
代理人
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地址
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