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发明名称
Loose-leaf post binder
摘要
申请公布号
US2510662(A)
申请公布日期
1950.06.06
申请号
US19470720741
申请日期
1947.01.08
申请人
NATIONAL BLANK BOOK COMPANY
发明人
SCHADE FRANK STANLEY
分类号
B42F13/12
主分类号
B42F13/12
代理机构
代理人
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