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发明名称
Circuit for detecting the frequency difference of simultaneously applied alternatingcurrent signals as a direct current signal
摘要
申请公布号
US3136900(A)
申请公布日期
1964.06.09
申请号
US19610146169
申请日期
1961.10.19
申请人
BELL & HOWELL COMPANY
发明人
BELL NORTON W.
分类号
H03D13/00
主分类号
H03D13/00
代理机构
代理人
主权项
地址
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