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发明名称
Production of bitumen
摘要
申请公布号
US2117177(A)
申请公布日期
1938.05.10
申请号
US19340741296
申请日期
1934.08.24
申请人
KORNEL KELL
发明人
KELL KORNEL
分类号
C10G21/00;C10G73/06
主分类号
C10G21/00
代理机构
代理人
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地址
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