TOS SN55A, SN63A, SN71A, SN-55B, SN-63B and SN-71B Lathes: Parts Manual as Sectional Drawings with Electrical Schematics and reproductions of the (frequently damaged or missing) Screwcutting Charts.
TOS SN-55B, SN-63B and SN-71B Lathes: Operation Maintenance and Parts Manual. The Operation Manual has links that point to illustrations in the Parts Manual.