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发明名称
Loose leaf ring binder
摘要
申请公布号
US3098490(A)
申请公布日期
1963.07.23
申请号
US19610116201
申请日期
1961.06.09
申请人
S. E. & M. VERNON, INC.
发明人
WANCE FRANK
分类号
B42F13/26
主分类号
B42F13/26
代理机构
代理人
主权项
地址
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