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发明名称
Rotary drilling bit
摘要
申请公布号
US1949049(A)
申请公布日期
1934.02.27
申请号
US19290403222
申请日期
1929.10.29
申请人
JESSE C. WRIGHT;WILLIAM H. MAXWELL
发明人
HOPKINS SAMUEL RAY
分类号
E21B10/08;E21B10/18
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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