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发明名称
Drum-controlled repeating perforator
摘要
申请公布号
US1750216(A)
申请公布日期
1930.03.11
申请号
US19270209444
申请日期
1927.07.30
申请人
THE TABULATING MACHINE COMPANY
发明人
EWALD BERNHARD KARL FRITZ
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主分类号
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