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发明名称
Communication system
摘要
申请公布号
US2162370(A)
申请公布日期
1939.06.13
申请号
US19370154345
申请日期
1937.07.19
申请人
WEBSTER ELECTRIC COMPANY
发明人
CAMPBELL RICHARD H.
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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