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发明名称
Ring binder or the like
摘要
申请公布号
US3039472(A)
申请公布日期
1962.06.19
申请号
US19590846958
申请日期
1959.10.16
申请人
DUNCAN JAMES K
发明人
DUNCAN JAMES K.
分类号
B42F13/00;B42F13/16
主分类号
B42F13/00
代理机构
代理人
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