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发明名称
Portable drilling rig
摘要
申请公布号
US2104323(A)
申请公布日期
1938.01.04
申请号
US19340740380
申请日期
1934.08.18
申请人
WORTHINGTON PUMP AND MACHINERY CORPORATION
发明人
HIRSCHBERG CHARLES A.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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