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摘要
申请公布号
US1779796(A)
申请公布日期
1930.10.28
申请号
US19290396542
申请日期
1929.10.01
申请人
BALDUF FREDERICK H
发明人
BALDUF FREDERICK H.
分类号
G09F7/08
主分类号
G09F7/08
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