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发明名称
Map holder
摘要
申请公布号
US2508136(A)
申请公布日期
1950.05.16
申请号
US19450609257
申请日期
1945.08.06
申请人
HANNS BEIER
发明人
BEIER HANNS
分类号
G09B29/10
主分类号
G09B29/10
代理机构
代理人
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