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发明名称
Loose-leaf binder
摘要
申请公布号
US2255537(A)
申请公布日期
1941.09.09
申请号
US19380238325
申请日期
1938.11.02
申请人
WILSON-JONES COMPANY
发明人
UNGER PAUL O.
分类号
B42F13/04
主分类号
B42F13/04
代理机构
代理人
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地址
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