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发明名称
Improvements in telephone relaying and amplifying means for the aid of deaf or like persons
摘要
申请公布号
GB589918(A)
申请公布日期
1947.07.03
申请号
GB19440023748
申请日期
1944.11.28
申请人
GERARD MICHAEL HORVITCH
发明人
分类号
H04M1/215
主分类号
H04M1/215
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