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发明名称
Variable selective system
摘要
申请公布号
US2339633(A)
申请公布日期
1944.01.18
申请号
US19420435877
申请日期
1942.03.23
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GILMAN GEORGE W.
分类号
H03B21/02;H03H19/00
主分类号
H03B21/02
代理机构
代理人
主权项
地址
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