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经营范围
发明名称
Friction cathead
摘要
申请公布号
US2640683(A)
申请公布日期
1953.06.02
申请号
US19480046789
申请日期
1948.08.30
申请人
THE NATIONAL SUPPLY COMPANY
发明人
LONG SPENCER W.
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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