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发明名称
Method of mining sulphur
摘要
申请公布号
US1814539(A)
申请公布日期
1931.07.14
申请号
US19280326173
申请日期
1928.12.15
申请人
BENJAMIN ANDREWS
发明人
ANDREWS BENJAMIN
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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