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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
GB559539(A)
申请公布日期
1944.02.23
申请号
GB19420011701
申请日期
1942.08.20
申请人
AUTOMATIC TELEPHONE & ELECTRIC COMPANY LIMITED;REGINALD TAYLOR;GEORGE THOMAS BAKER
发明人
分类号
H04Q1/36
主分类号
H04Q1/36
代理机构
代理人
主权项
地址
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