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发明名称
Loose leaf binder
摘要
申请公布号
US1859689(A)
申请公布日期
1932.05.24
申请号
US19290407727
申请日期
1929.11.16
申请人
WOLF WALTER F
发明人
WOLF WALTER F.
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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