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- Imperial War Museum
- Imperial War Museum- North
- Imperial Wheel Co
- Imperial Wire Co
- Imperial and International Communications
- Impervia
- Impex-Essen
- Impex Electrical
- Implement and Machinery Review
- Implitico
- Import Development
- Importers' Protection Association
- Impregnated Diamond Products
- Improved Britannia Motors
- Improved Construction Co
- Improved Electric Glow-Lamp Co
- Improved Electric Traction Co
- Improved Gears
- Improved Hinges
- Improved Hinges (Warwick)
- Improved Industrial Dwellings Co
- Improved Liquid Glues Co
- Improved Martin's Anchor Co
- Improved Patent Forced Draught Furnace Syndicate
- Improved Sanitary Appliances Co
- Improved Steel Co
- Improved Submerged Log Co
- Improved Wood Pavement Co
- Impulse
- Imray, Laurie, Norie and Wilson
- Imray and Copeland
- Imre Engineering Co
- Imre Gaspar
- Imre Kiralfy
- Imrie, Tomlinson and Co
- Imrie Bell
- In-Sink-Erator
- InBev
- Ina Erskine McNeil
- Ina Needle Bearings
- Inabata
- Inbucon
- Incandescent Electric Lighting Co
- Incandescent Gas Light Co
- Incandescent Group
- Incandescent Heat Co
- Incandescent Supply Agency
- Ince Forge Co
- Ince Hall Coal and Cannel Co
- Ince Hall Rolling Mills Co
- Ince Power Station
- Inchcape
- Inchgreen Engineering Co
- Inchicore Engineering Society
- Inchicore Works
- Incinerator Co
- Incledon and Lamberts
- Inclinator Co
- Inclined Tramway, Saltburn-By-The-Sea
- Inco Alloys
- Incorporated Association of Electric Power Companies
- Incorporated Association of Municipal and County Engineers
- Incorporated Clerks of Works Association
- Incorporated Froebel Educational Institute
- Incorporated Gas Institute
- Incorporated General Steam Carriage Co
- Incorporated Law Society
- Incorporated Municipal Electrical Association
- Incorporated Society of Auctioneers and Landed Property Agents
- Increased Power Co
- Ind, Coope and Co
- Ind Coope
- Indalex
- Indented Bar and Concrete Engineering Co
- Indented Steel Bar Co
- Independent Broadcasting Authority
- Independent Chapel, Castle Street, Exeter
- Independent Gas Co
- Independent Pneumatic Tool Co
- Independent Schools Information Service (ISIS)
- Independent Tank
- Independent Television Authority
- Independent Television News
- Inder and Henderson
- Indes Refrigerators
- Indestructible Ignition Tube Syndicate
- Indestructible Paint Co
- Indestructible Paint and Standard Varnish
- Indestructible Steel Co
- Index Automatic Machine Co
- Index Automatic Machines
- India
- India Mill, Bacup
- India Mill, Blackburn
- India Mill, Darwen
- India Mill, Preston
- India Mills
- India Mills, Bacup
- India Mills, Heaton Norris
- India Mills, Manchester
- India Mills Cotton Spinning Co
- India Red Flash Tyres
- India Rubber, Gutta Percha, and Telegraph Works Co
- India Rubber, Gutta Percha and Telegraph Works Co
- India Rubber Depot
- India Rubber Flooring Co
- India Rubber Manufacturers Association
- India Rubber Products Co
- India Tea Centre
- India Tourist Office
- India Tyre and Rubber Co
- India Tyres
- Indian
- Indian Army Reserve of Officers
- Indian Arts and Crafts
- Indian Branch Railway
- Indian Institute of Science
- Indian Iron and Steel Co
- Indian Iron and Steel Co (of India)
- Indian Midland Railway
- Indian Motorcycle
- Indian Motorcycle Co
- Indian Motorcycle Sales
- Indian Oil Co
- Indian Railway Board
- Indian Railways
- Indian Railways: Central Railway
- Indian Railways: Eastern Railway
- Indian Railways: Mileage Open
- Indian Railways: North Eastern Railway
- Indian Railways: Northern Railway
- Indian Railways: The Early Lines
- Indian Railways - Southern Railway
- Indian Railways Bureau
- Indian Rolling Stock Co
- Indian State Railways
- Indian States Railways
- Indian Steelworks Construction Co
- Indian and Eastern Engineer Co
- Indian motor cycle
- Indiana Imp Cyclecar Co
- Indiana Road Machine Co
- Indianapolis Machinery and Supply Co
- Indicators International
- Indo-Burma Petroleum Co
- Indo-China Steam Navigation Co
- Indo-European Commerce and Industries
- Indo-European Telegraph
- Indo-European Telegraph Co
- Indore State Railway
- Indra Line
- Induction Hardeners
- Inductotherm Europe
- Indurated Pulley Cover Co
- Indurite
- Indus Flotilla Co
- Indus Valley Railway
- Indus Valley State Railway
- Indusmond (Diamond Tools)
- Industria (London)
- Industrial Acoustics Co
- Industrial Appliances
- Industrial Asphalts Co
- Industrial Automation Controls
- Industrial Automation Group
- Industrial Bank of Scotland
- Industrial Biography, Iron Workers and Tool Makers by Samuel Smiles
- Industrial Brushware
- Industrial Co-partnership Association
- Industrial Coal and Iron Co
- Industrial Colloids
- Industrial Control Services
- Industrial Control Systems
- Industrial Crafts
- Industrial Data Processing
- Industrial Development Authority
- Industrial Diamond Information Bureau
- Industrial Drives
- Industrial Education International
- Industrial Electric Vehicles and Trucks
- Industrial Electronics
- Industrial Engineering
- Industrial Engineering Co
- Industrial Engineering Company of America
- Industrial Fan and Heater Co
- Industrial Furnaces
- Industrial Gifts
- Industrial Glove Co
- Industrial Guarantee Corporation
- Industrial Guarding Equipment
- Industrial Hydraulics
- Industrial Improvements Co
- Industrial Instrument Services Co
- Industrial Instruments
- Industrial Iron Co
- Industrial League
- Industrial League and Council
- Industrial Machinery Supplies
- Industrial Magnets
- Industrial Manufacturing Co
- Industrial Motor Co
- Industrial Newspapers
- Industrial Pharmaceutical Service
- Industrial Planning
- Industrial Plant Co
- Industrial Precision Castings
- Industrial Pumps
- Industrial Reorganisation Corporation
- Industrial Research Laboratories
- Industrial Revolution
- Industrial Rubber Products
- Industrial Science
- Industrial Sidings
- Industrial Society
- Industrial Speciality (Iron and Steel)
- Industrial Steels
- Industrial Tapes
- Industrial Tools and Equipment Co
- Industrial Trading Co
- Industrial Training Council
- Industrial Transport Association
- Industrial Transport Publications
- Industrial Trucks
- Industrial Utilities (Birmingham)
- Industrial Waste Eliminators
- Industrial Welfare Society
- Industrial Works
- Industrial and Commercial Finance Corporation
- Industrial and Domestic Heaters
- Industrial and Home Knitting Machines
- Industrial and Maritime Riggers
- Industrial and Mining Supplies Co
- Industrial and Process Engineering Consultants
- Industrial and Trade Fairs
- Industrials
- Industrie (London)
- Industries Telug
- Industry Mill, Darwen
- Industry Mill, Oldham
- Industry Mill, Padiham and Highham
- Industry and Commerce in South West England
- Inecto Salons
- Ineos
- Inertia Switch
- Infallible Exposure Meter Co
- Infant Welfare Centre, Exeter
- Infast Group
- Infirmary Mill, Blackburn
- Information Handling
- Infradex
- Infutec
- Ing Perthen
- Ingall, Parsons, Clive and Co
- Ingall, Phillips and Co
- Ingenuities
- Ingersoll
- Ingersoll-Rand Co
- Ingersoll Corner
- Ingersoll Engineers
- Ingersoll Locks
- Ingersoll Milling Machine Co
- Ingersoll Rand Co
- Ingersoll Sergeant Drill Co
- Ingham, Dewhurst, Illingworth Group
- Ingham, Sharples and Co
- Ingham Haden
- Ingham Sutcliffe
- Inghams Thornhill Collieries
- Ingimex
- Ingleby Lathe Works
- Ingleby and Co
- Ingledew and Sons
- Inglemere Hotel, Arnside
- Ingleton Hotel
- Ingleton Viaduct
- Inglis
- Inglis' Garage
- Inglis, Hossack and Co
- Inglis Aircraft
- Inglis Boiler Syndicate
- Inglis Bridge, Monmouth
- Inglis Bridges
- Inglis and Co
- Inglis and Wakefield
- Ingliston
- Ingram, Kemp and Joyner
- Ingram, Stone and Co
- Ingram-Shaw
- Ingram Perkins and Co
- Ingram Thompson and Sons
- Ingram and Co
- Ingram and Co (of Blandford)
- Ingram and Royle
- Ingram and Stapfer
- Ingram and Ward
- Ingrams
- Ingrow Railway Centre
- Ingrow Railway Station
- Ings Foundry
- Ingvard, Rasmussen and Co
- Inigo Brassey Freeman-Thomas
- Inishowen Maritime Museum
- Initial Plastics
- Initial Services
- Initial Towel Supply Co
- Injection Maintenance
- Injection Moulders
- Inland Hire Cruisers
- Inland Steel Co
- Inland Waterway Cruising Co
- Inman
- Inman Line
- Inman and International Steamship Co
- Inmos
- Innerd and Young
- Innes
- Innes, Henderson and Co
- Innes, Smith and Co
- Innes, Sons and King
- Innes Anderson
- Innes Lee Motor Co
- Innes Protected Paints
- Innes Walker (Engineering)
- Innes and Grieve
- Inney Consols Copper and Silver Lead Mine
- Innishannon Steam and Vintage Rally
- Inniss and Riddle
- Innocent Tunnel
- Innovation Light Co
- Innoxa
- Inoue Masaru
- Inpac Automation
- Inpower Works
- Inrad Services
- Insac
- Insch Museum
- Inshaw Seamless Iron and Steel Tubes
- Inskipp and Mackenzie
- Insley (London)
- Insley Industrial
- Insley Industrial Supply Co
- Insole and Grimley
- Insole and Jones
- Insole and Sons
- Insoles