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挪威ＭＨ(ＭａｒｉｔｉｍｅＨｙｄｒａｕｌｉｃｓ)公司近年来生产ＰＴＤ系列轻便顶驱和ＤＤＭ系列重型顶驱。在ＰＴＤ系列顶驱中,取消了原来的ＰＴＤＨＹ—12×355型和ＰＴＤＥＬ2ＰＡ44—5Ｗ型顶驱,开发了ＰＴＤ—Ｓ350型顶驱,形成了ＰＴＤ—Ｓ350型、ＰＴＤ—410型和Ｐ?..
In recent years, MH (MaritimeHydraulics) company in PTD series of portable top-drive and DDM series of heavy top drive. In the PTD series top drive, the original PTDHY-12 × 355 and PTDEL2PA44-5W top drives were eliminated and the PTD-S350 top drive was developed to form the PTD-S350, PTD-410 and P?