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摘要
申请公布号
US1932372(A)
申请公布日期
1933.10.24
申请号
US19320587210
申请日期
1932.01.18
申请人
A. KIMBALL COMPANY
发明人
LAENCHER FREDERICK W.
分类号
G09F3/06
主分类号
G09F3/06
代理机构
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