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发明名称
Method of and apparatus for amplifying weak electric currents
摘要
申请公布号
US1810539(A)
申请公布日期
1931.06.16
申请号
US19260129546
申请日期
1926.08.16
申请人
FEDERAL TELEGRAPH COMPANY
发明人
SOKOLOFF BORIS N.
分类号
H03F15/00
主分类号
H03F15/00
代理机构
代理人
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