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发明名称
Improvements in or relating to telephone systems
摘要
申请公布号
GB474653(A)
申请公布日期
1937.11.04
申请号
GB19360026935
申请日期
1936.10.05
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;JOHN EDWARD COLLYER
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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地址
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