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发明名称
LEHR- UND VERANSCHAULICHUNGSGERAET FUER DEN MUSIKUNTERRICHT.
摘要
申请公布号
DE1617970(U)
申请公布日期
1950.12.21
申请号
DE195000D1230U
申请日期
1950.08.26
申请人
JOSEF DUERR
发明人
JOSEF DUERR
分类号
主分类号
代理机构
代理人
主权项
地址
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