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经营范围
发明名称
Coal-cutting machine
摘要
申请公布号
US1797475(A)
申请公布日期
1931.03.24
申请号
US19220596475
申请日期
1922.10.23
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
LEVIN NILS D.
分类号
E21C29/10
主分类号
E21C29/10
代理机构
代理人
主权项
地址
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