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发明名称
Loose-leaf binder
摘要
申请公布号
US2532771(A)
申请公布日期
1950.12.05
申请号
US19460660954
申请日期
1946.04.10
申请人
BERNARD BERCOVITZ
发明人
JOHNSTONE LOUIS WILLIAM;GILBERT CHARLES EDWARD
分类号
B42F13/00
主分类号
B42F13/00
代理机构
代理人
主权项
地址
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