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发明名称
EDUCATIONAL DEVICE FOR USE IN CONVERSION BETWEEN NUMBER SYSTEMS
摘要
申请公布号
US3599350(A)
申请公布日期
1971.08.17
申请号
USD3599350
申请日期
1970.04.15
申请人
NAVY USA
发明人
ARTHUR MOSKOWITZ
分类号
G09B19/02;(IPC1-7):G09B19/02
主分类号
G09B19/02
代理机构
代理人
主权项
地址
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