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发明名称
VIBRATORY DRILL APPARATUS
摘要
申请公布号
GB8333871(D0)
申请公布日期
1984.02.01
申请号
GB19830033871
申请日期
1983.12.20
申请人
WINK, F W
发明人
分类号
E21B7/24;E21B25/00;(IPC1-7):E21B25/00
主分类号
E21B7/24
代理机构
代理人
主权项
地址
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