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发明名称
Rock bit dullness indicator
摘要
申请公布号
US3363702(A)
申请公布日期
1968.01.16
申请号
US19660568333
申请日期
1966.07.27
申请人
ESSO PRODUCTION RESEARCH COMPANY
发明人
BIELSTEIN WALTER J.
分类号
E21B12/02
主分类号
E21B12/02
代理机构
代理人
主权项
地址
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