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经营范围
发明名称
Educational teaching and grading machine
摘要
申请公布号
US3175303(A)
申请公布日期
1965.03.30
申请号
US19620227389
申请日期
1962.10.01
申请人
KIRKCONNELL THOMAS W
发明人
KIRKCONNELL THOMAS W.
分类号
G09B3/06
主分类号
G09B3/06
代理机构
代理人
主权项
地址
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