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发明名称
Flushing device for well drills
摘要
申请公布号
US1922436(A)
申请公布日期
1933.08.15
申请号
US19310534717
申请日期
1931.05.04
申请人
HUGHES TOOL COMPANY
发明人
HERRINGTON JOHN A.
分类号
E21B10/18;E21B10/24
主分类号
E21B10/18
代理机构
代理人
主权项
地址
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