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发明名称
Process for preparing coal veins for gasification by removal of underlying clay
摘要
申请公布号
US2561639(A)
申请公布日期
1951.07.24
申请号
US19490101997
申请日期
1949.06.29
申请人
FREDERICK SQUIRES
发明人
SQUIRES FREDERICK
分类号
E21B43/17;E21B43/247
主分类号
E21B43/17
代理机构
代理人
主权项
地址
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