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发明名称
Core drill
摘要
申请公布号
US2503561(A)
申请公布日期
1950.04.11
申请号
US19450629373
申请日期
1945.11.19
申请人
E. J. LONGYEAR COMPANY
发明人
PICKARD ALBERT F.
分类号
E21B10/48;E21B21/10;E21B25/00;E21B25/12
主分类号
E21B10/48
代理机构
代理人
主权项
地址
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