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发明名称
Double-walled drill pipe
摘要
申请公布号
EP1156183(B1)
申请公布日期
2004.09.01
申请号
EP20010105688
申请日期
2001.03.07
申请人
BAUER MASCHINEN GMBH
发明人
WEIXLER, LEONHARD
分类号
E21B17/00;E21B17/18;F16L47/24;(IPC1-7):E21B17/00;F16L9/147;F16L9/18
主分类号
E21B17/00
代理机构
代理人
主权项
地址
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