Matrix (Coventry Gauge and Tool Company) No. 37 and No. 47 Type 3 Taper Thread Grinding Machines. Operator's Instruction and Maintenance Manual with Dismantling Instructions.

Matrix (Coventry Gauge and Tool Company) No. 37 and No. 47 Type 2 Plunge-cut Thread Grinding Machines. Service and Maintenance Manual with Parts as Sectional Drawings and Dismantling Instructions. Stored FC2-D1