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发明名称
Lehrbaukasten
摘要
申请公布号
DE829519(C)
申请公布日期
1952.01.28
申请号
DE1950H001421
申请日期
1950.01.29
申请人
FRIEDRICH HESS
发明人
HESS FRIEDRICH
分类号
A63H33/10;G09B25/04
主分类号
A63H33/10
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