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经营范围
发明名称
Kelly bushing
摘要
申请公布号
US1899946(A)
申请公布日期
1933.03.07
申请号
US19320601558
申请日期
1932.03.28
申请人
EMSCO DERRICK & EQUIPMENT COMPANY
发明人
DAVIDSON WILLIAM D.
分类号
E21B3/04
主分类号
E21B3/04
代理机构
代理人
主权项
地址
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