TOS SN40, SN45 & SN50 Parts Manual TOS SN40, SN45 and SN50 Lathes Parts Manual as Sectional Drawings with Electrical Schematics. Includes a copy of the often-damaged screwcutting charts. Manufacturers: TOS Trencin Models: SN40 SN50 SN45 SN-40 SN-45 SN-50 Contents: Parts Manual Electrical Diagrams