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发明名称
Calculation device for pedagogical purposes
摘要
申请公布号
CH615774(A5)
申请公布日期
1980.02.15
申请号
CH19780000323
申请日期
1978.01.12
申请人
LEISMANN, HELMUT, GMBH
发明人
FRITZ BALZER
分类号
G06C1/00;G06G1/14;G09B19/02;(IPC1-7):G09B19/02
主分类号
G06C1/00
代理机构
代理人
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地址
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