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发明名称
VORRICHTUNG ZUM STEIGERN EINER SCHLAGWIRKUNG
摘要
申请公布号
DE69837479(D1)
申请公布日期
2007.05.16
申请号
DE19986037479
申请日期
1998.08.07
申请人
WEATHERFORD/LAMB INC.
发明人
FRIIS, NIELS CHRISTIAN
分类号
E21B31/107
主分类号
E21B31/107
代理机构
代理人
主权项
地址
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