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经营范围
发明名称
Purification of wood rosin
摘要
申请公布号
US2573454(A)
申请公布日期
1951.10.30
申请号
US19490094852
申请日期
1949.05.23
申请人
HOWARD M. HEMPSTEAD;LOUISE M. HEMPSTEAD
发明人
KNOX WILLIAM G.;CUNNINGHAM GEORGE L.
分类号
C09F1/00
主分类号
C09F1/00
代理机构
代理人
主权项
地址
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