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发明名称
Improvements in or relating to devices for holding books in the open position
摘要
申请公布号
GB617450(A)
申请公布日期
1949.02.07
申请号
GB19460029255
申请日期
1946.10.01
申请人
WILLIAM ACKERS NIXON;ARCHIBALD EDWIN WARD
发明人
分类号
A47B23/06
主分类号
A47B23/06
代理机构
代理人
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