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发明名称
Automatic cathead
摘要
申请公布号
US2314733(A)
申请公布日期
1943.03.23
申请号
US19380202194
申请日期
1938.04.15
申请人
OWEN FRANK M
发明人
OWEN FRANK M.
分类号
E21B19/16
主分类号
E21B19/16
代理机构
代理人
主权项
地址
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