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发明名称
Interstation communication system
摘要
申请公布号
US2199220(A)
申请公布日期
1940.04.30
申请号
US19390285072
申请日期
1939.07.18
申请人
HUBERT FRENCH
发明人
FRENCH HUBERT
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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