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发明名称
Electromagnetic card file
摘要
申请公布号
US3333591(A)
申请公布日期
1967.08.01
申请号
US19660536762
申请日期
1966.03.23
申请人
DAHL JR ERNEST A
发明人
JR. ERNEST A. DAHL,
分类号
G06K21/02
主分类号
G06K21/02
代理机构
代理人
主权项
地址
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