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发明名称
Simplification du mode opératoire dans l'emploi des règles à calcul et la multiplication de leur précision par n, par la création d'un centre de symétrie
摘要
申请公布号
FR971033(A)
申请公布日期
1951.01.11
申请号
FRD971033
申请日期
1948.09.03
申请人
发明人
DESCHAMPS ELIE-PAUL-EMILE
分类号
G06G1/12
主分类号
G06G1/12
代理机构
代理人
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