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发明名称
Typing rhythm indicator
摘要
申请公布号
US2348744(A)
申请公布日期
1944.05.16
申请号
US19420447567
申请日期
1942.06.18
申请人
MCMURRY GLENN D
发明人
MCMURRY GLENN D.
分类号
G09B13/00
主分类号
G09B13/00
代理机构
代理人
主权项
地址
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