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发明名称
Reversible book
摘要
申请公布号
US2544568(A)
申请公布日期
1951.03.06
申请号
US19470742854
申请日期
1947.04.21
申请人
SHEPHERD JOSEPH H
发明人
SHEPHERD JOSEPH H.
分类号
B42D1/00
主分类号
B42D1/00
代理机构
代理人
主权项
地址
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