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发明名称
MODELL ZUR VERANSCHAULICHUNG MATHEMATISCHER BEGRIFFE.
摘要
申请公布号
DE1942345(U)
申请公布日期
1966.07.14
申请号
DE196600W6860U
申请日期
1966.03.11
申请人
BERTHOLD WICHMANN
发明人
BERTHOLD WICHMANN
分类号
主分类号
代理机构
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