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发明名称
Improvements in telecommunications system
摘要
申请公布号
GB492379(A)
申请公布日期
1938.09.19
申请号
GB19370005071
申请日期
1937.02.19
申请人
WILLIAM GEORGE HAROLD FINCH
发明人
分类号
H04M11/06
主分类号
H04M11/06
代理机构
代理人
主权项
地址
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