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发明名称
摘要
申请公布号
JPS5944552(B2)
申请公布日期
1984.10.30
申请号
JP19810071406
申请日期
1981.05.14
申请人
NIPPON STEEL CORP
发明人
KAMYAMA FUJIMASA;INOE SEISUKE;AKASE SHIGEYUKI
分类号
F16L15/00;E21B17/042;E21B17/08;F16L15/04;F16L15/06
主分类号
F16L15/00
代理机构
代理人
主权项
地址
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