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发明名称
Reading-rate device
摘要
申请公布号
US2662307(A)
申请公布日期
1953.12.15
申请号
US19510221558
申请日期
1951.04.18
申请人
SIMPSON ELIZABETH A
发明人
SIMPSON ELIZABETH A.
分类号
G09B17/04
主分类号
G09B17/04
代理机构
代理人
主权项
地址
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