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发明名称
Règle à calculs multiples
摘要
申请公布号
FR912337(A)
申请公布日期
1946.08.06
申请号
FRD912337
申请日期
1945.07.09
申请人
发明人
VERNET JEAN-FRANCOIS
分类号
G06G1/12
主分类号
G06G1/12
代理机构
代理人
主权项
地址
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