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发明名称
Earth drill bit
摘要
申请公布号
US2524428(A)
申请公布日期
1950.10.03
申请号
US19460657371
申请日期
1946.03.27
申请人
DAY CHESTER B;GLENN GAULT ERROL
发明人
DAY CHESTER B.;GAULT ERROL GLENN
分类号
E21B10/14
主分类号
E21B10/14
代理机构
代理人
主权项
地址
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