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发明名称
Key punch attachment
摘要
申请公布号
US2342516(A)
申请公布日期
1944.02.22
申请号
US19430473849
申请日期
1943.01.28
申请人
NEVIN DONALD A
发明人
NEVIN DONALD A.
分类号
G06K21/06
主分类号
G06K21/06
代理机构
代理人
主权项
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