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发明名称
Double action drifter drill
摘要
申请公布号
US2812922(A)
申请公布日期
1957.11.12
申请号
US19560593920
申请日期
1956.06.26
申请人
ESSO RESEARCH AND ENGINEERING COMPANY
发明人
BLOUNT ALVIE E.;FLATOW TOBIAS
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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