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发明名称
Tubing-head stud lock
摘要
申请公布号
US2798747(A)
申请公布日期
1957.07.09
申请号
US19540428169
申请日期
1954.05.07
申请人
SHAFFER TOOL WORKS
发明人
AUER LELAND S.
分类号
E21B33/04
主分类号
E21B33/04
代理机构
代理人
主权项
地址
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