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发明名称
Perfectionnements aux mesures de fréquence portant sur des courants d'amplitude variable
摘要
申请公布号
FR842554(A)
申请公布日期
1939.06.14
申请号
FRD842554
申请日期
1938.08.25
申请人
TELEFUNKEN GESELLSCHAFT FU:R DRAHTLOSE TELEGRAPHIE M.B.H.
发明人
分类号
G01R23/09
主分类号
G01R23/09
代理机构
代理人
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