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发明名称
Perfectionnements aux changeurs de fréquences
摘要
申请公布号
FR945454(A)
申请公布日期
1949.05.05
申请号
FRD945454
申请日期
1947.02.27
申请人
COMPAGNIE FRANCAISE THOMSON-HOUSTON
发明人
分类号
H03D7/14
主分类号
H03D7/14
代理机构
代理人
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