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发明名称
Paper holder for draftsmen
摘要
申请公布号
US2559744(A)
申请公布日期
1951.07.10
申请号
US19460697260
申请日期
1946.09.16
申请人
WILT JAMES W
发明人
WILT JAMES W.
分类号
B43L5/02
主分类号
B43L5/02
代理机构
代理人
主权项
地址
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