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发明名称
Time reminding device
摘要
申请公布号
US1940453(A)
申请公布日期
1933.12.19
申请号
US19330651973
申请日期
1933.01.16
申请人
SARGENT HITCHCOCK HELEN
发明人
HITCHCOCK HELEN SARGENT
分类号
G04B19/28
主分类号
G04B19/28
代理机构
代理人
主权项
地址
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