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经营范围
发明名称
ESCO CORP
摘要
申请公布号
GB2074980(B)
申请公布日期
1984.02.15
申请号
GB19810008532
申请日期
1981.03.18
申请人
ESCO CORP
发明人
分类号
E21B10/04;E02F9/28;(IPC1-7):E02F9/28
主分类号
E21B10/04
代理机构
代理人
主权项
地址
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