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发明名称
Lehrgeraet
摘要
申请公布号
DE1547492(A1)
申请公布日期
1969.11.06
申请号
DE19671547492
申请日期
1967.04.19
申请人
ENCYCLOPAEDIA BRITTANICA INC.
发明人
CHRISTOPHER LADAS,ALEXIS
分类号
G09B5/04
主分类号
G09B5/04
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