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经营范围
发明名称
Combined abacus and counting rack
摘要
申请公布号
US2646631(A)
申请公布日期
1953.07.28
申请号
US19470723553
申请日期
1947.01.22
申请人
NATHAN LAZAR
发明人
LAZAR NATHAN
分类号
G09B19/02
主分类号
G09B19/02
代理机构
代理人
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