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1.Diamond-shaped face on diamond-shaped face on blowout preventers, valves, chokes, or the like 失效
标题翻译: 防喷器,阀,扼流圈等上的菱形表面上的菱形面公开(公告)号:USD521537S1
公开(公告)日:2006-05-23
申请号:US29210780
申请日:2004-07-21
申请人: Douglas A. Jahnke , Leonard D. Kemp
设计人: Douglas A. Jahnke , Leonard D. Kemp