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发明名称
ROCK-DRILLING METHOD AND DEVICE THEREFOR
摘要
申请公布号
JPH02289794(A)
申请公布日期
1990.11.29
申请号
JP19890282842
申请日期
1989.10.30
申请人
INGERSOLL RAND CO
发明人
AACHI RENON
分类号
E21D9/08;E21B4/16;E21B7/00;E21B7/28
主分类号
E21D9/08
代理机构
代理人
主权项
地址
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