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经营范围
发明名称
EXAMINATION GRADING COMPUTER
摘要
申请公布号
GB1271953(A)
申请公布日期
1972.04.26
申请号
GB19690035139
申请日期
1969.07.11
申请人
EDUCATIONAL COMPUTER SYSTEMS INC.
发明人
分类号
G06K17/00;G09B3/08
主分类号
G06K17/00
代理机构
代理人
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