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发明名称
TEST GRADING DEVICE
摘要
申请公布号
US3601906(A)
申请公布日期
1971.08.31
申请号
USD3601906
申请日期
1969.02.10
申请人
MINNESOTA MINING AND MFG. CO.
发明人
JOHN L. ROCHE
分类号
G09B7/00;G06K17/00;G06Q50/00;G09B3/08;(IPC1-7):G09B7/00
主分类号
G09B7/00
代理机构
代理人
主权项
地址
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