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发明名称
Method of and apparatus for mining coal and the like
摘要
申请公布号
US2104579(A)
申请公布日期
1938.01.04
申请号
US19350016792
申请日期
1935.04.17
申请人
BENNETT GEORGE L
发明人
BENNETT GEORGE L.
分类号
E21C37/06
主分类号
E21C37/06
代理机构
代理人
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