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发明名称
Loose-leaf book construction
摘要
申请公布号
US2322180(A)
申请公布日期
1943.06.15
申请号
US19420470291
申请日期
1942.12.26
申请人
S. E. & M. VERNON INC.
发明人
VERNON MURRAY
分类号
B42F13/00;B42F13/16
主分类号
B42F13/00
代理机构
代理人
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