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发明名称
Test grading device
摘要
申请公布号
US3054196(A)
申请公布日期
1962.09.18
申请号
US19600025975
申请日期
1960.05.02
申请人
DURHAM HOWARD P
发明人
DURHAM HOWARD P.
分类号
G09B3/08
主分类号
G09B3/08
代理机构
代理人
主权项
地址
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