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发明名称
Drill pipe stress indicator
摘要
申请公布号
US3255627(A)
申请公布日期
1966.06.14
申请号
US19630275180
申请日期
1963.04.16
申请人
SHELL OIL COMPANY
发明人
DOIG KEITH;FOSTER KENNETH W.
分类号
E21B47/00
主分类号
E21B47/00
代理机构
代理人
主权项
地址
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