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发明名称
Collapsible bookholder
摘要
申请公布号
GB352217(A)
申请公布日期
1931.07.09
申请号
GB19300018941
申请日期
1930.06.21
申请人
JOHN GEORGE CRACKNELL
发明人
分类号
A47B19/00;A47B23/02
主分类号
A47B19/00
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