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发明名称
Questionnaire recorder
摘要
申请公布号
US2431784(A)
申请公布日期
1947.12.02
申请号
US19440555871
申请日期
1944.09.26
申请人
PRIVATE OPINIONS, INC.
发明人
WHITE PEREIVAL
分类号
B41L5/00
主分类号
B41L5/00
代理机构
代理人
主权项
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