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发明名称
Gripping device
摘要
申请公布号
US2189244(A)
申请公布日期
1940.02.06
申请号
US19380227018
申请日期
1938.08.26
申请人
PHILLIPS PETROLEUM COMPANY
发明人
GILBERT LLOYD A.
分类号
E21B19/00
主分类号
E21B19/00
代理机构
代理人
主权项
地址
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