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经营范围
发明名称
Procédé et dispositif pour rendre inintelligibles à un tiers assistant à une conversation par telephone, les paroles prononcées devant l'appareil téléphonique
摘要
申请公布号
MC340(A)
申请公布日期
1962.08.07
申请号
MC19620000366
申请日期
1962.01.13
申请人
VULLIET-DURAND JACQUES;DARMONT PAUL
发明人
分类号
H04K;H04M;(IPC1-7):H04K
主分类号
H04K
代理机构
代理人
主权项
地址
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