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发明名称
Braille slate
摘要
申请公布号
US3340625(A)
申请公布日期
1967.09.12
申请号
US19650470856
申请日期
1965.07.09
申请人
DUKANE CORPORATION
发明人
SUPITILOV MICHAEL C.
分类号
G09B21/02
主分类号
G09B21/02
代理机构
代理人
主权项
地址
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