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发明名称
Hilfsvorrichtung zum Lernen von Fremdsprachen.
摘要
申请公布号
CH271394(A)
申请公布日期
1950.10.31
申请号
CHD271394
申请日期
1949.09.27
申请人
SOLENTHALER,KARL
发明人
SOLENTHALER,KARL
分类号
G09B19/08
主分类号
G09B19/08
代理机构
代理人
主权项
地址
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