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经营范围
发明名称
Selbstkontrollierendes Lochkarten-Lehrmaterial
摘要
申请公布号
DE1572925(A1)
申请公布日期
1970.08.13
申请号
DE19671572925
申请日期
1967.12.20
申请人
KIENDL,HARRO
发明人
KIENDL,HARRO
分类号
G09B3/08
主分类号
G09B3/08
代理机构
代理人
主权项
地址
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