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发明名称
BROENNVERKTOEY.
摘要
申请公布号
NO885460(A)
申请公布日期
1989.08.04
申请号
NO19880005460
申请日期
1988.12.08
申请人
OTIS ENGINEERING CORP
发明人
HENDERSON, WILLIAM D.
分类号
E21B17/06;E21B23/04;(IPC1-7):E21B43/00
主分类号
E21B17/06
代理机构
代理人
主权项
地址
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