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发明名称
Procédé et dispositifs pour assurer le secret des communications téléphoniques
摘要
申请公布号
FR869170(A)
申请公布日期
1942.01.26
申请号
FRD869170
申请日期
1941.01.11
申请人
发明人
THURM LE DR. LEON
分类号
H04K1/02
主分类号
H04K1/02
代理机构
代理人
主权项
地址
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