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发明名称
Drilling bit
摘要
申请公布号
US2357835(A)
申请公布日期
1944.09.12
申请号
US19420452680
申请日期
1942.07.20
申请人
CARL C. CAWTHON;LEE R. LEISSLER
发明人
LEISSLER LEE R.
分类号
E21B10/42;E21B10/60
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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