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发明名称
Selectivity switching device
摘要
申请公布号
US2547984(A)
申请公布日期
1951.04.10
申请号
US19460658723
申请日期
1946.04.01
申请人
SMITH WILLIAM L
发明人
SMITH WILLIAM L.
分类号
H04B1/26
主分类号
H04B1/26
代理机构
代理人
主权项
地址
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