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- Irwell Mill, Radcliffe
- Irwell Rubber Co
- Irwell Steam Ferry Co
- Irwell Street Bridge
- Irwell Street Mill, Radcliffe
- Irwell Vale Mills, Helmshore
- Irwell and Eastern Rubber Co
- Irwin, Atkinson and Young
- Irwin J. Whitty
- Irwin Montgomery Greig
- Irwin Napier Colin Clarke
- Irwin and Jones
- Irwine John Whitty
- Isaac Agnew
- Isaac Althorp Ridgway
- Isaac Andrews and Sons
- Isaac Armstrong
- Isaac Arrowsmith
- Isaac Ashe
- Isaac Aydon
- Isaac Babbitt
- Isaac Barnes
- Isaac Beardmore
- Isaac Beck
- Isaac Bentley and Co
- Isaac Best and Co
- Isaac Blackburn
- Isaac Blackburn (of Bermondsey)
- Isaac Blackburn (of Leeds)
- Isaac Blackburn (of Plymouth)
- Isaac Bradley
- Isaac Bradley (1833-1918)
- Isaac Braithwaite and Son
- Isaac Braithwaite and Sons
- Isaac Briggs
- Isaac Buckley
- Isaac Bury
- Isaac Butler (1837-1917)
- Isaac Carr
- Isaac Carr and Co
- Isaac Chard
- Isaac Charles Johnson
- Isaac Chorlton and Co
- Isaac Clark Griffith
- Isaac Clements
- Isaac Connell
- Isaac Cookson
- Isaac Cookson (1679-1743)
- Isaac Cookson (1745-1831)
- Isaac Cookson (1776-1851)
- Isaac Cookson (2)
- Isaac Cookson (3)
- Isaac Cookson and Co
- Isaac Cordingley
- Isaac Cox
- Isaac Curran
- Isaac Daniel
- Isaac Davies
- Isaac Dell
- Isaac Dixon and Co
- Isaac Dobson
- Isaac Dodds
- Isaac Dodds and Son
- Isaac Downing
- Isaac Dutton
- Isaac E. Lester
- Isaac Enoch Lester
- Isaac Farrell
- Isaac Frearson
- Isaac Fripp
- Isaac Fussell and Co
- Isaac Gardner
- Isaac Greaves
- Isaac Griffith Lloyd
- Isaac Griffiths and Sons
- Isaac Hadley Reddell
- Isaac Harlow
- Isaac Hartas
- Isaac Hartley
- Isaac Hawkins Browne
- Isaac Hayes
- Isaac Henry Storey
- Isaac Henry Wright
- Isaac Higginbottom
- Isaac Hill
- Isaac Hill and Son
- Isaac Hillier
- Isaac Hodgson
- Isaac Holden
- Isaac Holden and Sons
- Isaac Holdroyd
- Isaac Hollis and Sons
- Isaac Holloway
- Isaac Horton
- Isaac J. Abdela
- Isaac J. Burgess
- Isaac Jackson
- Isaac Jackson and Sons
- Isaac Jacob Abdela
- Isaac James
- Isaac James Jenks
- Isaac Jefferson
- Isaac Jenks
- Isaac Jenks and Sons
- Isaac John Mann
- Isaac Kenworthy
- Isaac Lester
- Isaac Lloyd
- Isaac Lord
- Isaac Lovell Berridge
- Isaac Lowthian Bell
- Isaac M. Singer and Co
- Isaac Mainwaring
- Isaac Marshall
- Isaac Marshall and Son
- Isaac Marshall and Sons
- Isaac Martin Aplin
- Isaac Mead
- Isaac Merritt Singer
- Isaac Moss
- Isaac Nash, Belbroughton
- Isaac Nash and Sons
- Isaac Newton
- Isaac Newton Lewis
- Isaac Nind Hopkins
- Isaac O'Toole
- Isaac Oliver Tyson
- Isaac Parkes
- Isaac Pearson
- Isaac Perrins
- Isaac Pimblott and Sons
- Isaac Pochin
- Isaac Porter
- Isaac Potter
- Isaac Povey
- Isaac Read
- Isaac Reckitt
- Isaac Roberts
- Isaac Robson and Co
- Isaac Robson and Sons
- Isaac Russell
- Isaac S. Taylor
- Isaac Sanford
- Isaac Seabrook
- Isaac Seville and Sons
- Isaac Shakespeare
- Isaac Sherwood and Sons
- Isaac Shoenberg
- Isaac Shone
- Isaac Simonett
- Isaac Slater
- Isaac Smith
- Isaac Smith (1839-1920)
- Isaac Smith (1839- )
- Isaac Spight
- Isaac Steele
- Isaac Stokes
- Isaac Storey
- Isaac Storey (1840-1876)
- Isaac Storey and Sons
- Isaac Summerhill and Co
- Isaac Sumsion
- Isaac Taylor and Co
- Isaac Teasdale
- Isaac Teasdale and Co
- Isaac Thompson
- Isaac Thompson (Engine Maker)
- Isaac Thornton
- Isaac Tipping
- Isaac Todhunter
- Isaac Vincent Robinson
- Isaac Vose
- Isaac W. H. White
- Isaac Walker
- Isaac Walton and Co
- Isaac Warren
- Isaac Watt Boulton
- Isaac Watts
- Isaac Webster
- Isaac Webster and Sons
- Isaac Wedgwood
- Isaac Westley Stokes
- Isaac Weston Aplin
- Isaac Wheeler
- Isaac Whitehouse and Co
- Isaac Whitesmith and Sons
- Isaac Wilkinson
- Isaac William Chubb
- Isaac William Hewitt White
- Isaac Wilson
- Isaac Wilson and Co
- Isaac Wolfson
- Isaac and Benjamin Dobson
- Isaac and Israel Walker
- Isaac and Robert Blackburn
- Isaac and Samuel
- Isaac and Sons
- Isaac and Thomas Cookson
- Isaacson
- Isaacson Engine Co
- Isaacson Radial Engine Co
- Isabel Hardwich
- Isabel Marks
- Isador Loewe
- Isaiah Bevan
- Isaiah Davies
- Isaiah Hall
- Isaiah Horton and Co
- Isaiah Oldbury
- Isaiah Platt
- Isaiah Platt (1860-1931)
- Isaiah Round Gittings
- Isaiah Smallpage
- Isaiah Smith
- Isaiah White
- Isaiah Woodall and Sons
- Isaias White
- Isambard Brunel, Junior (1837–1902)
- Isambard Kingdom Brunel
- Isca Foundry Co
- Isca Foundry and Engineering Co
- Isdaile and McCallum
- Isdale and McCullum
- Isell
- Isenthal and Co
- Isetta
- Isetta of Great Britain
- Isham Randolph
- Isham William James Baggs
- Isherwood and Hayes
- Ishevsk
- Ishikawajima-Harima Heavy Industries Co
- Ishikawajima Jyuko Co
- Isiah Oldbury
- Isidore Gluckstein
- Isidore McWilliam Bourke
- Isidore Montague Gluckstein
- Isidore Nillus
- Iskra
- Isla Components
- Isla Viaduct
- Island Craft
- Island Dock
- Island Lead Mills
- Island Spinning Co
- Island of Madeira
- Islay Seafoods
- Isle of Axholme Light Railway
- Isle of Dogs Canal
- Isle of Dogs and Marylebone Railway
- Isle of Grain Power Station
- Isle of Jura Distillery
- Isle of Man
- Isle of Man Bank
- Isle of Man Breweries
- Isle of Man Electricity Board
- Isle of Man Mill
- Isle of Man Mining Co
- Isle of Man Railway
- Isle of Man Steam Packet Co
- Isle of Man Steam Railway
- Isle of Man TT Race
- Isle of Man TT Races
- Isle of Man Telegraph Co
- Isle of Mull Railway
- Isle of Thanet Electric Tramways and Lighting Co
- Isle of Thanet Gas Light and Coke Co
- Isle of Thanet Steam Flour Mills
- Isle of Wight
- Isle of Wight (Newport Junction) Railway
- Isle of Wight Bus Museum
- Isle of Wight Bus and Coach Museum
- Isle of Wight Central Railway
- Isle of Wight County Council
- Isle of Wight Express Motor Syndicate
- Isle of Wight Glass Museum
- Isle of Wight Motorists Association
- Isle of Wight Railway
- Isle of Wight Steam Railway
- Isler and Co
- Isles
- Isles of Scilly: Misc Adverts
- Isles of Scilly Steamship Co
- Isleworth Road, Exeter
- Isleworth Rubber Co
- Islington Electricity Works
- Islington Iron Works (Brimingham)
- Islington Mill
- Islington Mill, Salford
- Islington Tunnel
- Islington and Euston Railway
- Islip Iron Co
- Ismail Pasha Sirry
- Ismailia Valve Co
- Ismay Cables
- Ismay Imrie and Co
- Ismay Industries
- Ismay Lamps
- Ismay Refrigerating Co
- Iso-Speedic Co
- Isobel (of Regent Street)
- Isocrete Co
- Isoji Ishiguro
- Isola Manufacturing Co
- Isolta Motors
- Isometric Optical Co
- Isometric Projections
- Ison's Eye and Ear Dispensary
- Ison, White and Bedford
- Isopad
- Isopon
- Isora Illuminating Ceilings
- Isosceles
- Isotope Developments
- Isotta-Fraschini
- Isotta Fraschini
- Isoult M. Bennett
- Israel Hey
- Israel Lillycrap
- Israel Newton
- Israel Newton and Sons
- Israel Ogden and Sons
- Israel Swindells
- Israel Williams
- Israel and Openheimer
- Isringhausen
- Isringhausen (GB)
- Issac Slater (Publisher)
- Issitt and Minter
- Istel
- Istvan Markovits (Badge Maker)
- Isuzu
- Isuzu (UK)
- Ital Audio
- Itala
- Itala Automobiles
- Itala Car
- Italcantieri
- Italhotels
- Italia
- Italia Line
- Italian Air Service
- Italian Battleship Regina Marherita
- Italian General Shipping
- Italian Lemons