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发明名称
Improvements in ring binders for books
摘要
申请公布号
GB469980(A)
申请公布日期
1937.08.06
申请号
GB19360016244
申请日期
1936.06.10
申请人
TRUSSELL MFG. CO.
发明人
分类号
B42B5/10
主分类号
B42B5/10
代理机构
代理人
主权项
地址
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