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发明名称
Apparatus for marking and for recovering oriented drill cores
摘要
申请公布号
US3207239(A)
申请公布日期
1965.09.21
申请号
US19610148897
申请日期
1961.10.31
申请人
TIEFBOHR-MESS-DIENST LEUTERT & HUGEL G.M.B.H.
发明人
HUGEL HELMUT
分类号
E21B25/16
主分类号
E21B25/16
代理机构
代理人
主权项
地址
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