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发明名称
Tableau pédagogique de changements d'unités en système métrique
摘要
申请公布号
FR1324390(A)
申请公布日期
1963.04.19
申请号
FR19620890356
申请日期
1962.03.07
申请人
发明人
ROHFRITSCH JEAN-CLAUDE
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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