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发明名称
Slide binder
摘要
申请公布号
US2639531(A)
申请公布日期
1953.05.26
申请号
US19500165992
申请日期
1950.06.03
申请人
ENGEMANN HERBERT H
发明人
ENGEMANN HERBERT H.
分类号
G03B21/64
主分类号
G03B21/64
代理机构
代理人
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