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发明名称
Method of mining coal
摘要
申请公布号
US2105504(A)
申请公布日期
1938.01.18
申请号
US19350039707
申请日期
1935.09.09
申请人
ERSKINE RAMSAY
发明人
RAMSAY ERSKINE
分类号
E21C27/16;E21C41/18;E21D23/00
主分类号
E21C27/16
代理机构
代理人
主权项
地址
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