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发明名称
Drift indicator
摘要
申请公布号
US2819537(A)
申请公布日期
1958.01.14
申请号
US19540426697
申请日期
1954.04.30
申请人
OSCAR O. COLLINS
发明人
PEEBLES EDGAR G.
分类号
E21B47/024
主分类号
E21B47/024
代理机构
代理人
主权项
地址
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