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经营范围
发明名称
Amplificateur de mesure pour tensions continues
摘要
申请公布号
FR896646(A)
申请公布日期
1945.02.27
申请号
FRD896646
申请日期
1943.07.21
申请人
FIRME W. H. JOENS & CO.
发明人
分类号
H03F3/40
主分类号
H03F3/40
代理机构
代理人
主权项
地址
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