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经营范围
发明名称
Rig for rotary drills
摘要
申请公布号
US2000975(A)
申请公布日期
1935.05.14
申请号
US19330678014
申请日期
1933.06.28
申请人
CHICAGO PNEUMATIC TOOL COMPANY
发明人
MITCHELL WILLIAM J.
分类号
E21B15/04
主分类号
E21B15/04
代理机构
代理人
主权项
地址
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