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1) Government Operated Facilities 

1.  Royal Ordnance Factory – Woolwich Arsenal – Woolwich,  Kent
   1. Royal Laboratory
   2. Royal Carriage Factory
2. Royal Small Arms Factory – Sparkbrook, Birmingham, Warwickshire
3. Royal Army Clothing Department – Pimlico, London, Middlesex
4. Royal Small Arms Repair Factory – Pimlico, London, Middlesex
5. R.O.D. Weedon – Weedon Beck, Northamptonshire, England.
6. Chemical Defence Experimental Establishment – Porton Down, Wiltshire

2) Private Companies & Contractors 

1. Gregory Browne, Woolwich, Kent, England
2. Gregory Kane, Dublin, County Dublin, Ireland
3. William Day, London, Middlesex, England
4. Thomas Stokoe, Hay-on-Wye, Breconshire, Wales
5. William Miller Limited, Portsea, Hampshire, England
6. Enderley Mills, Newcastle-under-Lyme, Staffordshire, England

3) Public Armaments, Explosives, Aircraft & Ship Building Companies 

1. Vickers-Armstrong Limited, Crayford, Kent, England
2. The National Explosives Company Limited, Hayle, Cornwall
3. The British & Colonial Explosives Co. Ltd., Perranporth, Cornwall
4. British Small Arms Factory, Birmingham, Warwickshire