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发明名称
Derrick construction
摘要
申请公布号
US1896530(A)
申请公布日期
1933.02.07
申请号
US19290332179
申请日期
1929.01.12
申请人
EMSCO DERRICK AND EQUIPMENT COMPANY
发明人
TROUT WILLIAM A.
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
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地址
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