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发明名称
Improvements in or relating to the underground gasification of coal
摘要
申请公布号
GB674082(A)
申请公布日期
1952.06.18
申请号
GB19490015989
申请日期
1949.06.15
申请人
NATIONAL RESEARCH DEVELOPMENT CORPORATION
发明人
WILLIAMS FRANK ARCHER
分类号
E21B43/243;E21B43/30
主分类号
E21B43/243
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代理人
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