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发明名称
Improvements in and relating to devices for cleaning the walls of bore holes
摘要
申请公布号
GB668350(A)
申请公布日期
1952.03.12
申请号
GB19490030621
申请日期
1949.11.29
申请人
ALBERT EDWARD ATKINSON
发明人
分类号
E21B37/02
主分类号
E21B37/02
代理机构
代理人
主权项
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