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发明名称
Abacus
摘要
申请公布号
US3092917(A)
申请公布日期
1963.06.11
申请号
US19610117394
申请日期
1961.06.15
申请人
PODELL HOWARD I
发明人
PODELL HOWARD I.
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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