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发明名称
ZEICHENGERAET, GLEICHZEITIG ALS ANSCHAUUNGS- UND LEHRMITTEL FUER DEN MATHEMATIKUNTERRICHT.
摘要
申请公布号
DE1784121(U)
申请公布日期
1959.02.26
申请号
DE195700SC754U
申请日期
1957.04.16
申请人
MARTIN SCHELLENBERGER;KARL LIEBERWIRTH
发明人
MARTIN SCHELLENBERGER;KARL LIEBERWIRTH
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主分类号
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