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发明名称
Improvements in impulse senders of the type used in telephone systems
摘要
申请公布号
GB490325(A)
申请公布日期
1938.08.12
申请号
GB19370015502
申请日期
1937.06.04
申请人
THE GENERAL ELECTRIC COMPANY LIMITED;ALEXANDER ALBERT CHUBB
发明人
分类号
H04M1/272
主分类号
H04M1/272
代理机构
代理人
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地址
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