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发明名称
Educational abacus set
摘要
申请公布号
US2840927(A)
申请公布日期
1958.07.01
申请号
US19560563999
申请日期
1956.02.07
申请人
PAUL O. TOBELER
发明人
HOFMANN KARL
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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