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发明名称
Appareil télégraphique pour télégraphie secrète
摘要
申请公布号
FR684136(A)
申请公布日期
1930.06.21
申请号
FRD684136
申请日期
1929.10.08
申请人
发明人
MICHEL RICHARD;DREYSE RICHARD
分类号
H04L9/38
主分类号
H04L9/38
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