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发明名称
TIEFBOHR-VORRICHTUNG
摘要
申请公布号
DD132803(A5)
申请公布日期
1978.11.01
申请号
DD19770201886
申请日期
1977.11.04
申请人
JOHANSSON,SVEN H.,SE
发明人
JOHANSSON,SVEN H.,SE
分类号
E21B4/02;E21B4/18;E21B4/20;E21B21/16;E21B33/072;E21C;(IPC1-7):E21B7/00
主分类号
E21B4/02
代理机构
代理人
主权项
地址
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