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发明名称
A new or improved apparatus for use in drilling boreholes
摘要
申请公布号
GB1011233(A)
申请公布日期
1965.11.24
申请号
GB19620031780
申请日期
1962.08.18
申请人
LILLESHALL COMPANY LIMITED
发明人
PRICE JOHN
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
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