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经营范围
发明名称
PUTGEREEDSCHAPPEN.
摘要
申请公布号
NL8102891(A)
申请公布日期
1982.01.18
申请号
NL19810002891
申请日期
1981.06.16
申请人
OTIS ENGINEERING CORPORATION TE CARROLLTON, TEXAS, VER. ST. V. AM.
发明人
分类号
E21B23/02;E21B33/129;E21B34/12;E21B47/00;E21B47/06;E21B49/08;(IPC1-7):E21B49/00
主分类号
E21B23/02
代理机构
代理人
主权项
地址
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