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发明名称
Nouveau procédé applicable aux électro-aimants permettant d'obtenir une plus grande efficacité avec une dépense de courant d'excitation moindre
摘要
申请公布号
FR723762(A)
申请公布日期
1932.04.14
申请号
FRD723762
申请日期
1931.10.01
申请人
发明人
DUBOIS GEORGES
分类号
H04R9/02
主分类号
H04R9/02
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