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经营范围
发明名称
PIJPKOPPELING.
摘要
申请公布号
NL164125(B)
申请公布日期
1980.06.16
申请号
NL19720000471
申请日期
1972.01.12
申请人
HYDROTECH INTERNATIONAL INC., HOUSTON, TEXAS, VER. ST. V. AM.
发明人
分类号
F16L21/08;E21B17/08;F16L37/00;F16L37/12;(IPC1-7):F16L37/12;E21B17/04
主分类号
F16L21/08
代理机构
代理人
主权项
地址
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