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发明名称
TAFEL ZUM ERLERNEN DES SCHREIBENS UND LESENS DER BRAILLE-BLINDENSCHRIFT.
摘要
申请公布号
DE1915314(U)
申请公布日期
1965.05.06
申请号
DE196500M0822U
申请日期
1965.02.19
申请人
WALTER MEHDORN O.H.G., INH. WOLFGANG MEHDORN
发明人
分类号
主分类号
代理机构
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