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Matrix (Coventry Gauge and Tool Company) Model 37 Automatic Indexing Worm Grinding Machine (Coventry Gauge and Tool Company). Detailed Operating Manual and Maintenance Guide.
Matrix No. 37 and 47 Taper Thread Grinding Manual
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.