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发明名称
Drilling devices
摘要
申请公布号
GB2139671(A)
申请公布日期
1984.11.14
申请号
GB19830016396
申请日期
1983.06.16
申请人
* LIPSKER & CO ENGINEERING SERVICES
发明人
MORDECHAI * YUGER
分类号
E21B7/00;E21B7/26;E21B10/32;(IPC1-7):E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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