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发明名称
Vorrichtung zum Messen der Frequenz und der Frequenzaenderung eines Wechselstrom-Versorgungs- bzw. -Verbrauchersystems
摘要
申请公布号
DE1006070(B)
申请公布日期
1957.04.11
申请号
DE1954M022616
申请日期
1954.04.02
申请人
MUIRHEAD & CO. LIMITED
发明人
BELL JOHN
分类号
G01R23/02
主分类号
G01R23/02
代理机构
代理人
主权项
地址
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