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发明名称
Improved apertured record cards and methods of manufacture thereof
摘要
申请公布号
GB987920(A)
申请公布日期
1965.03.31
申请号
GB19620046636
申请日期
1962.12.11
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
分类号
G03D15/10;G06K19/02
主分类号
G03D15/10
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