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发明名称
Test booklet having readily erasible answer sheet
摘要
申请公布号
US2879608(A)
申请公布日期
1959.03.31
申请号
US19560577387
申请日期
1956.04.10
申请人
THE WATKINS-STRATHMORE COMPANY
发明人
WATKINS DANIEL H.
分类号
G09B3/04
主分类号
G09B3/04
代理机构
代理人
主权项
地址
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