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经营范围
发明名称
Process of treating tars
摘要
申请公布号
US1976908(A)
申请公布日期
1934.10.16
申请号
US19290403125
申请日期
1929.10.28
申请人
THE BARRETT COMPANY
发明人
WITTENBERG LESTER
分类号
C10C1/16
主分类号
C10C1/16
代理机构
代理人
主权项
地址
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