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发明名称
Hilfsmittel zum anschaulichen Rechenunterricht
摘要
申请公布号
DE864462(C)
申请公布日期
1953.01.26
申请号
DE1950E000480
申请日期
1950.01.06
申请人
EISENKOLB JOSEF
发明人
EISENKOLB JOSEF
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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