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发明名称
Key-operated calculator
摘要
申请公布号
US2569508(A)
申请公布日期
1951.10.02
申请号
US19480061348
申请日期
1948.11.22
申请人
BELL PUNCH COMPANY LIMITED
发明人
WEBB CHRISTOPHER FREDERICK
分类号
G06C7/06
主分类号
G06C7/06
代理机构
代理人
主权项
地址
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