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发明名称
Spring hook
摘要
申请公布号
US2158372(A)
申请公布日期
1939.05.16
申请号
US19360094011
申请日期
1936.08.03
申请人
THE NATIONAL SUPPLY COMPANY
发明人
LONG SPENCER W.
分类号
E21B19/04
主分类号
E21B19/04
代理机构
代理人
主权项
地址
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