Norton manufacture and suppliers

Norton, being a relatively small manufacturer farmed out a fair bit of their parts, besides procurement of the obvious ancilliary parts.
Unfortunately nobody has taken the trouble to actually record what they made and what they farmed out.

Following list is to be regarded with reserve as I have not been able to find conclusive proof for some of the statements.
If anybody can shed more light it would be most useful to let it be known.

Manufacturer/supplier	Parts
Norton Motors Ltd. Bracebridge street, Birmingham	Engine, frames, forks and general assembly
*R.T. Shelley Ltd., Birmingham 1**	Castings and tools
Mason & Burns Ltd. (M&B) *2 Walsall	Frame lug castings and engine plates
Burman and Sons, Birmingham	Gearboxes (Initially a Sturmey Archer design)
Talboys Manufacturing Co. (TMC) *3 Witton, Birmingham	Petrol and oil tanks, stays, rear carriers, air cleaners exhausts/silencers, possibly mudguards and handlebars as well
Speedwell Gearcase Co. *4 Witton, Birmingham	Primary chain case, chain guard and possibly mudguards
Joseph Lucas Ltd., Birmingham	Lamps, switches, batteries, magneto's, dynamo's, CVC's, horns, wiring
AMAL Ltd., Birmingham	carburetters, handlebar controls
Doherty motor-cycle accessories, Birmingham	Handlebar controls
Herbert Terry & Sons Ltd., Redditch	Saddles, pillions seats, valve springs, wiring clips
Lycett saddle & motor accessories co. Ltd., Birmingham	Saddles, pillion seats
Hepworth & Grandage, Bradford	Hepolite pistons and rings
Wellworthy Piston Rings, Lymington	Pistons and piston rings
The Hoffmann MFG. Co., Chelmsford	Bearings
Skefko Ball Bearing Co. (SKF), Luton	Bearings
Dunlop Rubber Company Ltd., Birmingham	Tyres, wheel rims and Dunlopillo pillion seats
The Goodyear Tyre & Rubber Company (Great Britain) Ltd., Wolverhampton	Tyres
Firestone Tyre & Rubber Co. Ltd., Brentford	Tyres
Michelin Tyre Company Ltd., Stoke-on-Trent(UK)	Tyres
Ferodo, Chapel-en-le-Frith	Brake and clutch linings
The Reynold and Coventry chain company Ltd., Manchester	Chains
K.L.G. Sparking plugs Ltd., London	Spark plugs
Smith’s & Sons, motor accessories Ltd.	Speedo’s, speedo gearboxes and cables
Bowden (engineers) Ltd., London	Control cables
Swallow Coachbuilding Company (1935) Ltd., Walsall	Sidecar bodies
Vokes Ltd., London	Air cleaners
???	Bolts and nuts

Notes *

*1 R.T. Shelley (makers of automotive accessories) bought out Norton in 1908 and was already making parts for Norton. In 1913 the "Norton" company was liquidated and restarted under the name "Norton Motors Ltd". W.(Bill) Mansell moved from R.T. Shelley to take over the Norton management.
*2 Made frame lug castings for a.o. Matchless and Norton and likely others
*3 Was set up in association with Norton General Manager E.G.Lawrence and Norton Director W. Mansell in 1919.
*4 Neighbour of Talboys and took over the tank, sheet and press work of Talboys in 1978, primary chain case manufacture not fully certain but very likely. Still in business 2024.