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发明名称
Electrical device
摘要
申请公布号
US2284547(A)
申请公布日期
1942.05.26
申请号
US19380223557
申请日期
1938.08.06
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WEST JOHN W.
分类号
H04B1/16
主分类号
H04B1/16
代理机构
代理人
主权项
地址
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