Matrix (Coventry Gauge and Tool Company) No. 1A Cylindrical Grinding machine: Operator's Instruction and Lubrication Manual with electrical schematic.

Matrix (Coventry Gauge and Tool Company) No. 1A Cylindrical Grinding machine: Parts Manual as Sectional Drawings. Includes a detailed Sales and Specification Catalogue with annotated diagrams, electrical circuits, a foundation plan, lubrication diagram and clear descriptions of the machine's construction functions.