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发明名称
Improvements in or relating to drilling tubes
摘要
申请公布号
GB1125893(A)
申请公布日期
1968.09.05
申请号
GB19650053970
申请日期
1965.12.20
申请人
WALLRAM-HARTMETALL G.M.B.H.
发明人
分类号
E21B17/043;E21B17/046;E21B17/07
主分类号
E21B17/043
代理机构
代理人
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地址
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