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发明名称
Drill head
摘要
申请公布号
US2884818(A)
申请公布日期
1959.05.05
申请号
US19550512269
申请日期
1955.05.31
申请人
UNITED STATES DRILL HEAD CO.
发明人
SPECKIN ALFRED P.;BASHOR JAMES R.
分类号
B23B39/16
主分类号
B23B39/16
代理机构
代理人
主权项
地址
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