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发明名称
Improvements relating to drilling appliances
摘要
申请公布号
GB636768(A)
申请公布日期
1950.05.03
申请号
GB19470023878
申请日期
1947.08.28
申请人
VICTOR PRODUCTS (WALLSEND) LIMITED;REGINALD WILLIAM MANN
发明人
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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