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发明名称
Coal mining apparatus
摘要
申请公布号
US1904489(A)
申请公布日期
1933.04.18
申请号
US19290400063
申请日期
1929.10.16
申请人
THE JEFFREY MANUFACTURING COMPANY
发明人
LEVIN NILS D.
分类号
E21C31/00
主分类号
E21C31/00
代理机构
代理人
主权项
地址
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