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发明名称
RENSEVERKTOEY FOR ROER
摘要
申请公布号
NO172427(B)
申请公布日期
1993.04.13
申请号
NO19880001519
申请日期
1988.04.08
申请人
OTIS ENGINEERING CORPORATION
发明人
CLAPP, TIMOTHY D.;MCCORMICK, WILLIAM H.
分类号
E21B23/00;E21B37/00;E21B41/00;(IPC1-7):B08B9/02
主分类号
E21B23/00
代理机构
代理人
主权项
地址
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