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发明名称
Drilling mechanism
摘要
申请公布号
US1761310(A)
申请公布日期
1930.06.03
申请号
US19230641097
申请日期
1923.05.24
申请人
SULLIVAN MACHINERY COMPANY
发明人
OSGOOD CHARLES F.
分类号
E21B6/02;E21B6/06;E21B19/08
主分类号
E21B6/02
代理机构
代理人
主权项
地址
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