Matrix (Coventry Gauge and Tool Company) Measurement of Threaded Components. An unusually detailed Catalogue with explanations of how to use the various thread checking machines made by the company. Please note; this is a catalogue not a manual.

Matrix / Kand UX Optical projectors. The Care and Use of instruction Book.

Matrix (Coventry Gauge and Tool Company) Universal Single-Ribbed Wheel Generating Machine. Operating Instructions.