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发明名称
Improvements in electric signalling apparatus
摘要
申请公布号
GB373383(A)
申请公布日期
1932.05.26
申请号
GB19310013518
申请日期
1931.05.07
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;DENNIS CLARK ESPLEY
发明人
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
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地址
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