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发明名称
Coal-carbonizing apparatus for the extraction of bituminous materials
摘要
申请公布号
US1756969(A)
申请公布日期
1930.05.06
申请号
US19270173339
申请日期
1927.03.07
申请人
KARL BERGFELD
发明人
BERGFELD KARL
分类号
C10B1/04
主分类号
C10B1/04
代理机构
代理人
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地址
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