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发明名称
Safety joint
摘要
申请公布号
US3355189(A)
申请公布日期
1967.11.28
申请号
US19650430716
申请日期
1965.02.05
申请人
HASHA MALVERN M
发明人
HASHA MALVERN M.
分类号
E21B17/06
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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