Thompson / Matrix (Coventry Gauge and Tool Company) Type B and BB Surface Grinding Machines (sometimes badged Matrix-Thompson). Operator's Instruction Manual with Maintenance & Trouble-shooting Guides, lubrication and hydraulic charts and detailed technical descriptions of the machines.

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.