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经营范围
发明名称
METHOD OF MAKING A MINE SHAFT
摘要
申请公布号
PL126562(B1)
申请公布日期
1983.08.31
申请号
PL19800222653
申请日期
1980.03.11
申请人
发明人
分类号
E21D;E21D1/12;(IPC1-7):E21D1/12
主分类号
E21D
代理机构
代理人
主权项
地址
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