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- Roslin Hall Hotel, Torquay
- Rosling, Appleby and Fynn
- Rosling and Appleby
- Rosling and Fynn
- Rosling and Matthews
- Roslyn Holiday
- Ross
- Ross's
- Ross, Courtney and Co
- Ross, O'Connor and Co
- Ross-Hammond Special
- Ross (American)
- Ross (Baler)
- Ross Auto and Engineering Co
- Ross Automobile Co
- Ross Brothers
- Ross Catto and Co
- Ross Courtney
- Ross Courtney and Co
- Ross Engineers
- Ross Ensign
- Ross Foods
- Ross Frozen Food
- Ross Garages
- Ross Group
- Ross Mill, Bacup
- Ross N. Church
- Ross Poultry
- Ross Smith
- Ross Spinning Co
- Ross Winans
- Ross Young's Foodservice
- Ross and Alexander
- Ross and Catherall
- Ross and Co
- Ross and Co (Foundry)
- Ross and Co (London)
- Ross and Deering
- Ross and Donaldson
- Ross and Duncan
- Ross and Gibson
- Ross and Ledbury Railway
- Ross and Marshall
- Ross and Monmouth Railway
- Ross and Norton
- Ross and Robinson
- Ross and Wallace
- Ross and Walpole
- Rossel
- Rossel, Schwarz and Co
- Rossel-Peugeot
- Rossell
- Rossendale Belting Co
- Rossendale Cotton Spinning and Manufacturing Co
- Rossendale Dyeing Co
- Rossendale Glass and Wood Decorating Company
- Rossendale Hair Felt Co
- Rossendale Industrial Co
- Rossendale Mill, Stacksteads
- Rossendale Printing Co
- Rossendale Union Gas Co
- Rossendale Valley Tramways Co
- Rosser Heating
- Rosser and Russell
- Rossi's Motor Engineering Works
- Rossie Viaduct
- Rossignol
- Rossington Main Colliery Co
- Rossiter Worthington Raymond
- Rosslare Pier
- Rossleigh
- Rossleigh (of Leeds)
- Rossleigh Cycle Co
- Rosslyn Erskine Wemyss
- Rosslyn James Dalyell Richardson
- Rosstrevor, Bournemouth
- Rosyth Dockyard
- Rosyth Naval Base
- Rosyth Shipbreaking Co
- RotaBolt
- Rotadop
- Rotaflex
- Rotafrig Pty
- Rotalac
- Rotameter Manufacturing Co
- Rotapex
- Rotaprint
- Rotary Air Compressor Co
- Rotary Brush Wheels
- Rotary Electric Co
- Rotary Engine and Pump Co
- Rotary Engineering Co
- Rotary Group
- Rotary Hoes
- Rotary Louvre Furnaces
- Rotary Meter Company (1905)
- Rotary Photographic Co
- Rotary Screwing Die Syndicate
- Rotary Units
- Rotasphere Co
- Rotax
- Rotax Co
- Rotax Cycles
- Rotax Motor Accessories Co
- Rotax Motor Co
- Rotch, Fingell and Co
- Rotch and Finzel
- Rothamsted Experimental Station
- Rothay Hotel
- Rother Boiler Co
- Rother Vale Collieries
- Rother Vale Colliery Co
- Rother Valley Railway
- Rotherham-Tinsley Steel
- Rotherham Forge and Rolling Mills Co
- Rotherham Main Colliery
- Rotherham Power Station
- Rotherham Sewage Works
- Rotherham Steel Strip Co
- Rotherham and District Collieries Association
- Rotherham and Sons
- Rotherhithe Power Station
- Rotherhithe Tunnel
- Rotherhithe and Bermondsey Mechanics Institution
- Rothermel Corporation
- Rotheroe and Bastin
- Rothesay Dock
- Rothesay Hotel, Llandudno
- Rothesay Tramways Co
- Rothiemay Railway Bridge
- Rothman's King Size
- Rothmans
- Rothmans Rallying
- Rothsay Dock, Clydebank
- Rothschild Bridge, Halton
- Rothschild and Baker
- Rothwell
- Rothwell, Hick and Rothwell
- Rothwell, Hick and Rothwell: Union
- Rothwell Car
- Rothwell Cars
- Rothwell Hosiery Co
- Rothwell and Co
- Rothwell cars
- Rotinoff Atlantic
- Rotinoff Motors
- Rotiss-O-Mat
- Roto-Finish
- Roto-Motor Syndicate
- Roto Engineering Co (Bradford)
- Rotoflo
- Rotol
- Rotol Airscrews
- Rotolin Bearings
- Rotoplunge Pump Co
- Rotorcraft
- Rotork
- Rotork Controls
- Rotork Engineering Co
- Rotork Marine
- Rotorports
- Rotosan
- Rotoscythe
- Rotosigns
- Rotronic Instruments (UK)
- Rotterdam
- Rotterdam Dry Dock Co
- Rotterdam Drydock Co
- Rotterdam Lloyd Royal Mail Line
- Rotterdam Waterworks
- Rotterdamsche Droojdok-Maatchapij
- Rotunda
- Rouch and Leaker
- Rouen Transporter Bridge
- Rouen and Havre Railway
- Rouffet (Paris)
- Rougemont Hotel, Exeter
- Rougemont Terrace, Exeter
- Rough Lee Mill, Burnley
- Rough on Rats
- Roughdales Fire Clay Co
- Roughlee Mill, Burnley
- Roughlee Mill, Roughlee
- Roughsedge Wallwork
- Roughsedge and Summers
- Roughtown Mill, Mossley
- Roughway Paper Mills
- Rouke and Horsborough
- Roulette Cycle Co
- Roulunds (UK)
- Round Brothers
- Round Foundry
- Round Hill Mill, Bolton
- Round Hill Mill, Mill
- Round House Water Tower, Perth
- Round Oak Steel Powders
- Round Oak Steel Works
- Round Oak Steelworks
- Round Tree Inn, Exeter
- Roundabout Hotel
- Roundell Palmer
- Roundwood Colliery
- Roura and Forgas
- Rouse and Co
- Rouse and Co (of Bradford)
- Rouse and Graseby
- Roussel Laboratories
- Rousselot and Cie
- Route Indicator Co
- Routledge and Ommanney
- Rouyer Guillet and Co
- Rova Trading Co
- Rover
- Rover: 10
- Rover: 12
- Rover: 14
- Rover: 15
- Rover: 16
- Rover: 1929–32 Rover 2
- Rover: 20
- Rover: 2000
- Rover: 213/216
- Rover: 400
- Rover: 6
- Rover: 60
- Rover: 75
- Rover: 8
- Rover: 827
- Rover: BVV 2
- Rover: Cars
- Rover: Cycles
- Rover: E 698
- Rover: Meteor
- Rover: Motorcycles
- Rover: P3
- Rover: P4
- Rover: P5
- Rover: P6
- Rover: P 909
- Rover: Pilot
- Rover: ROV 4
- Rover: SDI
- Rover: Scarab
- Rover: Ten
- Rover Car
- Rover Cars
- Rover Co
- Rover Cycle Co
- Rover Eight
- Rover Gas Turbines
- Rover Group
- Rover Motor Co
- Rover Pilot
- Rover Scarab
- Rover Ten
- Roversford Foundry and Machine Co
- Rovex
- Rovex Scale Models
- Rovin
- Rowan and Boden
- Rowan and Co
- Rowan and Co (Glasgow)
- Rowan and Morton
- Rowan and Sons
- Rowe
- Rowe's Garage
- Rowe Brothers and Co
- Rowe and Potts
- Rowecord Engineering
- Rowell Motors
- Rowen-Arc
- Rowena Court Hotel
- Rowena Timberlake
- Rowenta
- Rowhedge Ironworks Co
- Rowland's Macassar Oil
- Rowland Baguley
- Rowland Barnett and Co
- Rowland Brotherhood
- Rowland Brothers
- Rowland Broughton Berkeley
- Rowland Browne
- Rowland Burdon (1756-1838)
- Rowland Burdon (1757-1838)
- Rowland Carr
- Rowland Carr and Co
- Rowland Childe
- Rowland Edward Brian Hunt
- Rowland Edward Dixon
- Rowland Emett
- Rowland F. W. Hodge
- Rowland Fisher
- Rowland Fletcher Brookes
- Rowland Fothergill
- Rowland Frost
- Rowland G. Foot and Co
- Rowland George Allanson Allanson-Winn
- Rowland George Harman
- Rowland Glave Saunders
- Rowland Greenwood
- Rowland H. Bound
- Rowland Hardy
- Rowland Harper
- Rowland Harrington-Moore
- Rowland Hartrick
- Rowland Henry Bound
- Rowland Hill
- Rowland Hill (1795-1879)
- Rowland Hill (1848-1930)
- Rowland Hill (2)
- Rowland Hill and Sons
- Rowland Hodge
- Rowland Hodges
- Rowland Hope Cobbold
- Rowland Janson
- Rowland Lewis Goold
- Rowland Lyall Wilson
- Rowland Lyttelton Archer Davies
- Rowland Lyttleton A. Davies
- Rowland Macdonald Stephenson
- Rowland Mason Ordish
- Rowland Maurice Cole
- Rowland Maxwell Thomason
- Rowland Moon
- Rowland Philipson
- Rowland Price
- Rowland Priest
- Rowland Rank
- Rowland Rawlins and Co
- Rowland Rawlinson
- Rowland S. Benson
- Rowland Slater Guy
- Rowland Smith
- Rowland Smith (1888-1988)
- Rowland Smith Motors
- Rowland Staniforth
- Rowland Stephenson
- Rowland Thomas Owen
- Rowland Trim
- Rowland W. Cash
- Rowland Walker and Sons
- Rowland Ward
- Rowland Watkin Lewis
- Rowland William Leader
- Rowland Wilton Cox