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发明名称
Rotatably mounted book holder
摘要
申请公布号
US2784522(A)
申请公布日期
1957.03.12
申请号
US19550480535
申请日期
1955.01.07
申请人
ART STEEL CO. INC.
发明人
BERGMAN ED
分类号
B42D17/00;B42F11/02
主分类号
B42D17/00
代理机构
代理人
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地址
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