Harrison "13-inch" and "15-inch" (identical apart from centre height) and badged variously as: 155, 165, 190 and "1300" and also branded as the "DoAll". Operator's Instruction Manual and Spare Parts Manual as Sectional Drawings. The Sectional drawings have, in many cases, been separated, scanned at extra-high resolution and greatly enlarged on the page for improved clarity. These very distinctive lathes differ from the other 155 and 165 L6 Mk.

HARRISON Lathes Models 12-inch and 13-inch swing L6 Mk. 3 - also badged as the 155 and 165 and distinguishable from earlier models by a flat front face to the headstock a long, single upward pointing handle on the face and two spindle-speed change levers on the top, a third control shaft control rod below the leadscrew and power-feeds shaft, a screwcutting gearbox with a sliding selector control that indexed into a row of holes. The gearbox had either two thumb lever along the top edge (English threading) or three thumb levers (metric version).

Harrison "13-inch" and "15-inch" (identical apart from centre height) and badged variously as: 155, 165, 190 and "1300" also ,listed as the L6 Mk.3. This is a very distinctive lathe - a sort of half-way house between the older and newer styles - and differs from the other 155 and 165 L6 Mk. 2 and 3 types in having:
- two spindle-speed levers pointing downwards on the front face of the headstock (instead of on top)
- large embossed sheet-aluminium covers on the headstock and face of the apron

Mercer 155 Electronic/Pneumatic Gauging. Setting and Instruction Manual.