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经营范围
发明名称
Safety joint for use in well strings
摘要
申请公布号
US2562298(A)
申请公布日期
1951.07.31
申请号
US19460689623
申请日期
1946.08.09
申请人
NEVA CREIGHTON VERA
发明人
CREIGHTON VERA NEVA
分类号
E21B17/06
主分类号
E21B17/06
代理机构
代理人
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地址
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