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发明名称
Drilling bit
摘要
申请公布号
US1809351(A)
申请公布日期
1931.06.09
申请号
US19290373883
申请日期
1929.06.26
申请人
ROLAND R. CRUM
发明人
OLIVER GUY CARLTON
分类号
E21B10/02;E21B10/26;E21B10/42;E21B10/60
主分类号
E21B10/02
代理机构
代理人
主权项
地址
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