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发明名称
Frame for blackboards
摘要
申请公布号
US2300248(A)
申请公布日期
1942.10.27
申请号
US19400369178
申请日期
1940.12.09
申请人
ELNETT ANTHONY A
发明人
ELNETT ANTHONY A.
分类号
A47B97/00
主分类号
A47B97/00
代理机构
代理人
主权项
地址
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