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发明名称
Perfectionnements à la fabrication des règles à calcul en aluminium
摘要
申请公布号
FR893542(A)
申请公布日期
1944.07.30
申请号
FRD893542
申请日期
1942.12.31
申请人
发明人
DAMIEN MAURICE
分类号
G06G1/04
主分类号
G06G1/04
代理机构
代理人
主权项
地址
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