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发明名称
Typewriter attachment
摘要
申请公布号
US2049667(A)
申请公布日期
1936.08.04
申请号
US19330699288
申请日期
1933.11.22
申请人
SEDGWICK PAUL J
发明人
SEDGWICK PAUL J.
分类号
G09C3/00
主分类号
G09C3/00
代理机构
代理人
主权项
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