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发明名称
Perforated record sensing device
摘要
申请公布号
US2490360(A)
申请公布日期
1949.12.06
申请号
US19470768559
申请日期
1947.08.14
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
JOHNSON REYNOLD B.
分类号
主分类号
代理机构
代理人
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