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发明名称
Sign
摘要
申请公布号
US2078183(A)
申请公布日期
1937.04.20
申请号
US19350033817
申请日期
1935.07.30
申请人
THE SINGER MANUFACTURING COMPANY
发明人
RAY JOSEPH L.
分类号
G09F21/04
主分类号
G09F21/04
代理机构
代理人
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