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发明名称
Calculating device
摘要
申请公布号
US3147556(A)
申请公布日期
1964.09.08
申请号
US19610138042
申请日期
1961.09.14
申请人
PRUSMACK MURRAY D
发明人
PRUSMACK MURRAY D.
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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