Thompson Surface Grinders A, B, C, BB, 4C, 5C & 3B Manual THOMPSON Grinder Co. (USA) Surface Grinding Machines Models A, B, C, BB, 4C, 5C & 3B. Operating manual with bearing and other adjustment instructions. Includes sectional drawings through a number of parts. Manufacturers: Thompson Models: 3B 4C 5C A B BB C Contents: Operators Manual Maintenance Manual