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发明名称
Polish rod holder
摘要
申请公布号
US2768417(A)
申请公布日期
1956.10.30
申请号
US19540447637
申请日期
1954.08.03
申请人
SEYBERT GUY W
发明人
SEYBERT GUY W.
分类号
E21B19/10
主分类号
E21B19/10
代理机构
代理人
主权项
地址
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