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发明名称
Heavy duty cutting head for earth boring tools
摘要
申请公布号
US2886292(A)
申请公布日期
1959.05.12
申请号
US19560577153
申请日期
1956.04.09
申请人
PETERSEN GERALD A M
发明人
PETERSEN GERALD A. M.
分类号
E21B10/44;E21B10/62;E21B10/633
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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