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发明名称
Page holding device for books
摘要
申请公布号
US2692780(A)
申请公布日期
1954.10.26
申请号
US19520266491
申请日期
1952.01.15
申请人
BILLINGS HARRY P
发明人
BILLINGS HARRY P.
分类号
B42D3/14;B42D9/00
主分类号
B42D3/14
代理机构
代理人
主权项
地址
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