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发明名称
Self-reading grade target
摘要
申请公布号
US3170239(A)
申请公布日期
1965.02.23
申请号
US19630252792
申请日期
1963.01.21
申请人
COTTON EDGAR W
发明人
COTTON EDGAR W.
分类号
G01C5/00;G01C15/06
主分类号
G01C5/00
代理机构
代理人
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地址
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