HEPWORTH HYDRAULIC COPYING (TRACER) Attachments for the Hepworth Series 150, 300, 400, 450, 470, 472, 600 & 620 Models as commonly fitted to Colchester, Harrison, Milmor, Smart & Brown, Dean Smith & Grace, Willson, Kerry, Broadbent-Schofield and many other makes. A complete 140-page Data Pack with Detailed Operation Manuals and Spare Parts Manuals as Sectional and other drawings. This is the most complete set of information for these attachments available - a collection of all the literature ever produced. Covers both the head units and the pump-tank assemblies.