HEPWORTH HYDRAULIC COPYING (TRACER) Attachments for Series: 150, 300, 400, 450, 470, 472, 600 & 620 as fitted to Colchester, Harrison, Milmor, Smart & Brown, Dean Smith & Grace, Willson, Kerry, Broadbent-Schofield and many others. Detailed Operation Manual and Spares as Sectional Drawings. This is the most complete data pack for these attachments and a complete collection of all the literature ever produced. Operator's Instruction Manual, Maintenance and Settings and Spares Parts as Sectional Drawings. Covers both the head units and the pump-tank assemblies.