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发明名称
IN BUCHFORM AUFKLAPPBARE MAPPE, INSBESONDERE ZUR VERWENDUNG VON SPRACHKURSUNTERLAGEN MIT SCHALLPLATTEN.
摘要
申请公布号
DE1737593(U)
申请公布日期
1957.01.10
申请号
DE195600Z4232U
申请日期
1956.06.22
申请人
STANISLAUS ZAORALEK
发明人
STANISLAUS ZAORALEK
分类号
主分类号
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