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经营范围
发明名称
Improvements in or relating to electrical signalling systems
摘要
申请公布号
GB618488(A)
申请公布日期
1949.02.22
申请号
GB19460031807
申请日期
1946.10.26
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;GEORGE THOMAS BAKER
发明人
分类号
H04M15/08
主分类号
H04M15/08
代理机构
代理人
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