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经营范围
发明名称
Braille cell cap
摘要
申请公布号
US8221123(B2)
申请公布日期
2012.07.17
申请号
US12645654
申请日期
2009.12.23
申请人
发明人
分类号
G09B0021/000000
主分类号
G09B0021/000000
代理机构
代理人
主权项
地址
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