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经营范围
发明名称
HULLGRAVER.
摘要
申请公布号
NO854621(A)
申请公布日期
1986.05.21
申请号
NO19850004621
申请日期
1985.11.19
申请人
ALH SYSTEMS LIMITED
发明人
CARRUTHERS, ALEC REGINALD
分类号
E21B7/24;E21B7/26;E21B7/30;(IPC1-7):E02F/;F16L/
主分类号
E21B7/24
代理机构
代理人
主权项
地址
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