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摘要
申请公布号
US2257991(A)
申请公布日期
1941.10.07
申请号
US19400315876
申请日期
1940.01.27
申请人
A. KIMBALL COMPANY
发明人
NORDEN ERICCSON B. VAN
分类号
G09F3/12
主分类号
G09F3/12
代理机构
代理人
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