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发明名称
DOWN-THE-HOLE HAMMER
摘要
申请公布号
JPH108869(A)
申请公布日期
1998.01.13
申请号
JP19960158090
申请日期
1996.06.19
申请人
SUN TEC:KK
发明人
NAKAYAMA KANAME;KOBAYASHI MAKOTO
分类号
E21B4/16;E21B4/06;E21B11/00;E21B17/02;E21B17/07;(IPC1-7):E21B4/16
主分类号
E21B4/16
代理机构
代理人
主权项
地址
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