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发明名称
Coal mining machine
摘要
申请公布号
US2399438(A)
申请公布日期
1946.04.30
申请号
US19450571519
申请日期
1945.01.05
申请人
ROBERT M. JOHNSON
发明人
JOHNSON ROBERT
分类号
E21C37/08
主分类号
E21C37/08
代理机构
代理人
主权项
地址
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