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发明名称
Perfectionnements aux dispositifs à action sélective pour le passage d'une ligne téléphonique de quatre fils en deux fils
摘要
申请公布号
FR1053491(A)
申请公布日期
1954.02.02
申请号
FRD1053491
申请日期
1952.04.07
申请人
发明人
PICQUENARD ARMEL
分类号
H04B1/58
主分类号
H04B1/58
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代理人
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