Surface pour écrire, aménagée dans le but de simplifier les opérations arithmétiques additives ou soustractives,申请号FRD1009185-传众专利搜索

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发明名称	Surface pour écrire, aménagée dans le but de simplifier les opérations arithmétiques additives ou soustractives
摘要
申请公布号	FR1009185(A)	申请公布日期	1952.05.26
申请号	FRD1009185	申请日期	1950.01.27
申请人		发明人	AMEDEE-MANNHEIM GERARD-AMEDEE
分类号	B42D15/00	主分类号	B42D15/00
代理机构		代理人
主权项
地址

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