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发明名称
Mining of sulfur
摘要
申请公布号
US2493413(A)
申请公布日期
1950.01.03
申请号
US19440542794
申请日期
1944.06.29
申请人
FREEPORT SULPHUR COMPANY
发明人
MCIVER DE WITT T.;LEE CLARENCE O.;AXELRAD BERNARD A.
分类号
E21B43/285
主分类号
E21B43/285
代理机构
代理人
主权项
地址
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