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发明名称
EDUCATIONAL DEVICE PRESENTING PICTORIAL AND NUMERICAL PROBLEMS
摘要
申请公布号
CA501789(A)
申请公布日期
1954.04.27
申请号
CAD501789
申请日期
申请人
ALBERT H. MERRILL
发明人
ALBERT H. MERRILL
分类号
主分类号
代理机构
代理人
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