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发明名称
Perforated record controlled tabulating machine
摘要
申请公布号
US2056841(A)
申请公布日期
1936.10.06
申请号
US19350049370
申请日期
1935.11.12
申请人
ROBERT DUNCAN;WILKINSON LESTER F
发明人
DUNCAN ROBERT;WILKINSON LESTER F.
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主分类号
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