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发明名称
Rotary drilling machine and pipe tongs
摘要
申请公布号
US2181641(A)
申请公布日期
1939.11.28
申请号
US19380224949
申请日期
1938.08.15
申请人
HICKS HAROLD C
发明人
HICKS HAROLD C.
分类号
E21B3/04;E21B19/16
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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