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经营范围
发明名称
Mining trepan
摘要
申请公布号
GB641010(A)
申请公布日期
1950.08.02
申请号
GB19470030606
申请日期
1947.11.18
申请人
JOSEPH DIONISOTTI
发明人
分类号
E21B10/40
主分类号
E21B10/40
代理机构
代理人
主权项
地址
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