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发明名称
Rechenapparat fuer die Veranschaulichung von Rechenaufgaben
摘要
申请公布号
DE1497691(A1)
申请公布日期
1969.11.13
申请号
DE19661497691
申请日期
1966.03.01
申请人
HANSEN,INGVALD
发明人
HANSEN,INGVALD
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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