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发明名称
STUETZSYSTEM FUER STEIGROHRLEITUNG.
摘要
申请公布号
DE3578748(D1)
申请公布日期
1990.08.23
申请号
DE19853578748
申请日期
1985.12.03
申请人
HUGHES TOOL CO., HOUSTON, TEX., US
发明人
NEELY, STEPHEN ALLEN, LONG BEACH CALIFORNIA, US
分类号
E21B17/01;E21B19/00;E21B33/038;F16L37/00;F16L39/00;(IPC1-7):E21B17/01
主分类号
E21B17/01
代理机构
代理人
主权项
地址
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