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发明名称
Portable training device for electric accounting machine operators
摘要
申请公布号
US2893137(A)
申请公布日期
1959.07.07
申请号
US19570673289
申请日期
1957.07.22
申请人
ALLING
发明人
ALLING JOHN F.;FLEISCHER ALFRED R.
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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