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发明名称
Magnetic bookmark
摘要
申请公布号
US2448611(A)
申请公布日期
1948.09.07
申请号
US19470747992
申请日期
1947.05.14
申请人
STANLEY MARTIN WILLIAM
发明人
MARTIN WILLIAM STANLEY
分类号
B42D9/00
主分类号
B42D9/00
代理机构
代理人
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