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发明名称
Kastenartiges Rechenlehrmittel fuer Schulen
摘要
申请公布号
DE667560(C)
申请公布日期
1938.11.14
申请号
DE1937W100651D
申请日期
1937.03.11
申请人
GEORG WOLLNITZA
发明人
WOLLNITZA GEORG
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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