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发明名称
Drawing instrument
摘要
申请公布号
US1844759(A)
申请公布日期
1932.02.09
申请号
US19280268149
申请日期
1928.04.07
申请人
HAMILTON KENNETH D;EDWARD HURST
发明人
HAMILTON KENNETH D.;HURST EDWARD
分类号
B43L7/02
主分类号
B43L7/02
代理机构
代理人
主权项
地址
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