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发明名称
Vorrichtung zur Erlernung des Einmaleins.
摘要
申请公布号
CH312239(A)
申请公布日期
1955.12.31
申请号
CHD312239
申请日期
1954.02.20
申请人
DEMARMELS,P. ANTON
发明人
ANTON DEMARMELS,P.
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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