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发明名称
Self-adjusting book cover
摘要
申请公布号
US2311153(A)
申请公布日期
1943.02.16
申请号
US19410398469
申请日期
1941.06.17
申请人
RALPH CARLO
发明人
CARLO RALPH
分类号
B42D3/04
主分类号
B42D3/04
代理机构
代理人
主权项
地址
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