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发明名称
Collapsible derrick
摘要
申请公布号
US2176965(A)
申请公布日期
1939.10.24
申请号
US19380190897
申请日期
1938.02.17
申请人
ALBERT HAYNES
发明人
HAYNES ALBERT
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
主权项
地址
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