This document describes the features and characteristics of the VW3 A9 401 and VW3 A9 402 series, including models such as ATVppH037M3, ATVppH075N4, ATVppHU75M3, ATVppHD11M3X, etc. The document also mentions the characteristics of HD18N4, ATVppHU55M3, ATVppHU55N4, etc.
