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经营范围
发明名称
Improvements in or relating to drill bits for deep well boring
摘要
申请公布号
GB726834(A)
申请公布日期
1955.03.23
申请号
GB19530001619
申请日期
1953.01.20
申请人
REED ROLLER BIT COMPANY
发明人
BOICE ELVIN GORDON
分类号
E21B10/52
主分类号
E21B10/52
代理机构
代理人
主权项
地址
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