TOS SN-55B, SN-63B and SN-71B Lathes: Operation, Maintenance and Parts Manual. TOS SN-55B, SN-63B and SN-71B Lathes: Large Operation, Maintenance and a Parts Manual as clear sectional drawings The Operation Manual has the annotated links that point to drawings in the Parts Manual. Manufacturers: TOS Skoda Models: SN55B SN63B SN71B Contents: Operators Manual Maintenance Manual Parts Manual