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发明名称
Hollow crown diamond bit
摘要
申请公布号
US3318400(A)
申请公布日期
1967.05.09
申请号
US19650444232
申请日期
1965.03.31
申请人
ESSO PRODUCTION RESEARCH COMPANY
发明人
HILDEBRANDT ALEXANDER B.
分类号
E21B10/46;E21B10/60
主分类号
E21B10/46
代理机构
代理人
主权项
地址
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