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- Harper Twist Co
- Harper and Co
- Harper and Co (of Aberdeen)
- Harper and Moores
- Harper and Rothwell
- Harper and Schofield
- Harper and Screen
- Harper and Tunstall
- Harper runabout
- Harpers
- Harpers Novelty Toy Co
- Harpers and Co
- Harpham and Co
- Harpic
- Harpur's Cycle Fittings Co
- Harpur Brothers and Mason
- Harpurhey Mills, Manchester
- Harpurhey Printing Co
- Harrah Automobile Collection
- Harrap Brothers
- Harrap Wilkinson
- Harridge Mills, Rochdale
- Harrie De Mussenden Rose
- Harrie Massey
- Harrie Tomlinson-Lee
- Harriet Baker
- Harriet Quimby
- Harriet Taylor
- Harriet Wynter
- Harriett Taylor
- Harrild and Sons
- Harring and Sons
- Harrington
- Harrington's Garage
- Harrington Aviation Museum
- Harrington Brothers
- Harrington Dock, Liverpool
- Harrington Fire Appliances Co
- Harrington Generators International
- Harrington Iron and Coal Co
- Harrington Lane, Exeter
- Harrington Moore
- Harrington and Brent
- Harrington and Co
- Harringtons
- Harringtons (Brighton)
- Harringtons (London)
- Harringtons (Skipton)
- Harringtons (of London)
- Harringtons Australia and New Zealand
- Harringworth Viaduct
- Harriot and Davidson
- Harriott and Davidson
- Harris
- Harris, Nicklin and Co
- Harris, Smith and Co
- Harris-Walton
- Harris (Boot and Legging Maker)
- Harris (of London)
- Harris (of Newcastle)
- Harris Booth
- Harris Brothers
- Harris Brothers (Bristol)
- Harris Brothers (of Bristol)
- Harris Cycle Co
- Harris Decorating
- Harris Dickinson
- Harris Engineering
- Harris Engineering Co
- Harris Filter Co
- Harris Gregory Williams
- Harris Henry Eley
- Harris Jurgen Carl Kuhl
- Harris Lebus
- Harris Patent Feed-Water Filter,
- Harris Patent Feed Water Filter (1910)
- Harris Performance
- Harris Plating Works
- Harris Publications
- Harris Skolnock
- Harris Tweed Association
- Harris and Barker
- Harris and Brounger
- Harris and Co
- Harris and Dixon
- Harris and Edgar
- Harris and Hasell
- Harris and Johnson
- Harris and Mills
- Harris and Others
- Harris and Pearson
- Harris and Samuels
- Harris and Sheldon
- Harris and Son
- Harris and Sons
- Harris and Sutherland
- Harris and Tatlow
- Harris of Calne
- Harrisburg Machine Co
- Harriscott
- Harrisflex Bearings
- Harrison
- Harrison's
- Harrison's Garage
- Harrison, Ainslie and Co
- Harrison, Ainslie and Roper
- Harrison, Blair and Co
- Harrison, Clark
- Harrison, Cox-Walker and Co
- Harrison, Fell and Co
- Harrison, Fisher and Co
- Harrison, McGregor and Co
- Harrison, McGregor and Guest
- Harrison, Scott and Co
- Harrison, Son and Jobson
- Harrison, Sons and Co
- Harrison, Teague and Birch
- Harrison-Hughes Engineering Laboratories
- Harrison (Agricultural Equipment)
- Harrison (Birmingham)
- Harrison (Motor Agencies)
- Harrison (of Dewsbury)
- Harrison (of Homerton)
- Harrison Automobile Co
- Harrison Benn
- Harrison Brothers
- Harrison Brothers (England)
- Harrison Brothers and Co
- Harrison Brothers and Howson
- Harrison Carter
- Harrison Engine Co
- Harrison Fisher and Co
- Harrison Hayter
- Harrison Hodgson
- Harrison Industries
- Harrison Jacques
- Harrison Knitting and Textile Machinery Co
- Harrison Lee and Sons
- Harrison Line
- Harrison Machine Works
- Harrison Manufacturing Co
- Harrison Meldrum
- Harrison Patent Knitting Machine Co
- Harrison Patent Steering Engine Co
- Harrison Patents Co
- Harrison Piano Co
- Harrison Prescott Eddy
- Harrison Roe
- Harrison S. Walton and Son
- Harrison Veevers
- Harrison and Camm
- Harrison and Clayton
- Harrison and Clough
- Harrison and Co
- Harrison and Co (Lincoln)
- Harrison and Co (Printers)
- Harrison and Co (of Birmingham)
- Harrison and Co (of London)
- Harrison and Co (of Sunderland)
- Harrison and Cook
- Harrison and Gray
- Harrison and Hall
- Harrison and Harrison
- Harrison and Horsley
- Harrison and Jones
- Harrison and Pearson
- Harrison and Rowley
- Harrison and Smith
- Harrison and Son
- Harrison and Son (of Morecambe)
- Harrison and Son (of Morecombe)
- Harrison and Sons
- Harrison and Standley
- Harrison and Swann
- Harrisons Stores
- Harrisons and Crosfield
- Harrisons of Dewsbury
- Harriss and Risse
- Harrods
- Harrods: Motor Department
- Harrogate A.C.
- Harrogate Electric Lighting Station
- Harrogate Gas Co
- Harrogate Railway
- Harrogate Spa
- Harrogate Waterworks Co
- Harrogate and District A.C.
- Harrogate and District Automobile Club
- Harrold Bridge
- Harrop Street Mills, Stalybridge
- Harrop and Benson
- Harrop and Hague
- Harrow-Bunn and Butler
- Harrow Chutney Co
- Harrow Electric Light and Power Co
- Harrow Garage
- Harrow Industrial Co
- Harrow Motor Factors
- Harrow and Stanmore Gas Co
- Harrow and Stanmore Railway
- Harrowby Mills, Farnworth
- Harrowing Steamship Co
- Harry A. Collier
- Harry A. Davies
- Harry A. Keen
- Harry Adams
- Harry Agland Hutchings
- Harry Albert Lawless Hepper
- Harry Alexander Bailey
- Harry Alexander Dormer
- Harry Alfred Bartram
- Harry Alfred Gaydon
- Harry Alfred Richardson
- Harry Algar Hutchings
- Harry Allcard
- Harry Allcock
- Harry Allen
- Harry Allen (1855-1899)
- Harry Anton Liebert
- Harry Arthur Bauchop
- Harry Arthur Dix
- Harry Arthur Hamshaw
- Harry Arthur Ruck-Keene
- Harry Ashley Bennett
- Harry Atkin (1862-1940)
- Harry Augustus Couves
- Harry Augustus Nott
- Harry Austin
- Harry Ball and Co
- Harry Bardsley Heywood
- Harry Barrett
- Harry Barton
- Harry Bates
- Harry Becher
- Harry Beebee and Co
- Harry Belcher
- Harry Benedetto Renwick
- Harry Bentham
- Harry Bentley
- Harry Bentley and Co
- Harry Berenbruch Peace
- Harry Bertram Nichols
- Harry Bingham Brown
- Harry Birch
- Harry Birch Killon
- Harry Bissell Jennings
- Harry Blundell
- Harry Bocquet
- Harry Bolton Daglish
- Harry Booth
- Harry Borlase Willock
- Harry Brand
- Harry Brearley
- Harry Brearly
- Harry Brooking
- Harry Brooks Toy
- Harry Brown
- Harry Bruce Fielding
- Harry Bryant Matthews
- Harry Burgess and Co
- Harry C. Ritchie
- Harry Cann
- Harry Carl Maxfield
- Harry Carnell
- Harry Carver
- Harry Cawley Swindells
- Harry Cecil Sheldon
- Harry Chapman
- Harry Charles Baillie Underdown
- Harry Charles David Scott
- Harry Charles Gearing
- Harry Charles Richard Mullens
- Harry Charles Scofield
- Harry Charles Western
- Harry Chown
- Harry Chubb
- Harry Church
- Harry Clark
- Harry Clayton Reeve
- Harry Clifford Armstrong
- Harry Clifford Biddell
- Harry Cobby
- Harry Collier
- Harry Collings Bishop
- Harry Cressman
- Harry Cromwell Lamb
- Harry Crook
- Harry Cross
- Harry Crothall Blackford
- Harry Crown
- Harry Crowther Slingsby
- Harry Cruse
- Harry Cunningham
- Harry Curphey
- Harry Cuthbert Buckmaster
- Harry D. Graulich
- Harry D. Jones
- Harry Dain
- Harry David Jones
- Harry Davies
- Harry Davis
- Harry Delacombe
- Harry Denid Melville Wright
- Harry Denis Griffiths
- Harry Dew
- Harry Dorning Bailey
- Harry Dufaur and Co
- Harry Duncan McGowan
- Harry Dutfield
- Harry E. Dey
- Harry Ebenezer Weller
- Harry Edward Gresham
- Harry Edward Johnson
- Harry Edward Jones
- Harry Edward Steel
- Harry Edward Wilkes
- Harry Edward Yerbury
- Harry Edwards Ketley
- Harry Edwin Bruce Bruce-Porter
- Harry Egerton Wimperis
- Harry Elson Timson
- Harry Emanuel
- Harry England
- Harry Epstein (Furniture)
- Harry Erlegh Footner
- Harry Ernest Albert Dymond
- Harry Ernest Medlin
- Harry Ernest Williams
- Harry Etches
- Harry Evelyn Marsh
- Harry F. Atkins
- Harry F. Atkins (person)
- Harry F. Coggon and Co
- Harry F. Maxwell
- Harry F. Rochat
- Harry Farman
- Harry Ferguson
- Harry Ferguson: 1910 First Flight in Ireland
- Harry Ferguson (Motors)
- Harry Ferguson Hodgson
- Harry Ferguson Ltd
- Harry Ferguson Research
- Harry Fergusson Fergusson-Wood
- Harry Fergusson Wood
- Harry Fisher Page