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发明名称
Alarm for typewriters
摘要
申请公布号
US1904744(A)
申请公布日期
1933.04.18
申请号
US19300466327
申请日期
1930.07.07
申请人
MANN WILLIAM F H
发明人
MANN WILLIAM F. H.
分类号
B41J29/48
主分类号
B41J29/48
代理机构
代理人
主权项
地址
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