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经营范围
发明名称
Improvements relating to rotary drilling bits for use in drilling coal, stone and like material
摘要
申请公布号
GB659460(A)
申请公布日期
1951.10.24
申请号
GB19490013037
申请日期
1949.05.16
申请人
SIEMENS-SCHUCKERT (GREAT BRITAIN), LIMITED;ALAN LUMLEY KIRKUP
发明人
分类号
B28D1/14;E21B10/54
主分类号
B28D1/14
代理机构
代理人
主权项
地址
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