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发明名称
MODERN MATHEMATICS DEMONSTRATION UNIT
摘要
申请公布号
US3461573(A)
申请公布日期
1969.08.19
申请号
USD3461573
申请日期
1967.09.05
申请人
WILLARD O. STIBAL
发明人
WILLARD O. STIBAL
分类号
G09B23/04;(IPC1-7):G09B23/04
主分类号
G09B23/04
代理机构
代理人
主权项
地址
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