Home › Blog › Buying Guide › From Inspection to Installation: What to Verify Before Buying a Pre-Owned, Used, Secondhand, Surplus Doosan NHP 4000 CNC Horizontal Machining Center made in South Korea f you’re considering acquiring a pre-owned or surplus Doosan NHP 4000 horizontal machining center (HMC) made in South Korea, it’s wise to perform a complete inspection through to installation....