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发明名称
NOZZLE ASSEMBLY FOR ENLARGING AN INGROUND PASSAGEWAY
摘要
申请公布号
EP0272905(A3)
申请公布日期
1989.06.28
申请号
EP19870311260
申请日期
1987.12.21
申请人
FLOWMOLE CORPORATION
发明人
TREMOULET, OLIVIER L.;FENDER, KENNETH E.;BURNS, ANDREW A.
分类号
E21B7/18;E21B7/28;E21B10/26;E21B10/60;E21B10/61;(IPC1-7):E21B7/18
主分类号
E21B7/18
代理机构
代理人
主权项
地址
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