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经营范围
发明名称
Portable rig front
摘要
申请公布号
US1952971(A)
申请公布日期
1934.03.27
申请号
US19330688664
申请日期
1933.09.08
申请人
CLARK JAMES B
发明人
CLARK JAMES B.
分类号
E21B1/02
主分类号
E21B1/02
代理机构
代理人
主权项
地址
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