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发明名称
Loose-leaf structure
摘要
申请公布号
US2193347(A)
申请公布日期
1940.03.12
申请号
US19380243806
申请日期
1938.12.03
申请人
NATIONAL BLANK BOOK COMPANY
发明人
SCHADE FRANK STANLEY
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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