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- Air Agency
- Air Battalion of the Corps of Royal Engineers
- Air Brush Manufacturing Co
- Air Call
- Air Commerce
- Air Conditioning and Engineering (N.I.)
- Air Control Industries
- Air Control Installations
- Air Defence Research and Development Establishment
- Air Dispatch
- Air Dispatch (Coachbuilders)
- Air Distribution Equipment
- Air Dryers
- Air Ducts
- Air Estates
- Air France
- Air Hire
- Air Holdings
- Air Impellor and Engineering Co
- Air India
- Air Industrial Developments
- Air Jamaica
- Air League of the British Empire
- Air Log Co
- Air Ministry
- Air Navigation Co
- Air Navigation and Engineering Co
- Air Pilots, Engineers and Navigators Association of British Columbia
- Air Plants
- Air Plants Heating
- Air Power Vacuum Cleaner Co
- Air Products
- Air Publicity
- Air Pumps
- Air Reduction Co
- Air Registration Board
- Air Sales (Oxford)
- Air Sales and Service
- Air Service Training
- Air Springs
- Air Survey Co
- Air Taxis
- Air Trainers
- Air Transport College
- Air Transport and Sales
- Air Travel
- Air Vehicles
- Air and Airways
- Air and Space Manufacturing Co
- Airbase, Coventry Airport
- Airborne Forces Experimental Establishment
- Airborne Industries
- Airborne Instruments Laboratory
- Airborne Service Equipment
- Airborne Shoes
- Airborne Upholstery
- Airbourne Assault
- Airbus
- Airbus Defence and Space
- Airbus UK
- Aircall
- Airco
- Aircraft-Marine Products
- Aircraft-Marine Products (G.B.)
- Aircraft: An Outline
- Aircraft Association
- Aircraft Co
- Aircraft Components Co
- Aircraft Constructions
- Aircraft Disposal Co
- Aircraft Distributors
- Aircraft Engineering
- Aircraft Engineering Components
- Aircraft Exchange and Mart
- Aircraft Furnishings
- Aircraft General Supplies
- Aircraft Hydraulic Appliances
- Aircraft Improvements Co
- Aircraft Industries Corporation
- Aircraft Manufacturing Co
- Aircraft Manufacturing Co: DH.1
- Aircraft Manufacturing Co: DH.10 Amiens
- Aircraft Manufacturing Co: DH.11 Oxford
- Aircraft Manufacturing Co: DH.16
- Aircraft Manufacturing Co: DH.18
- Aircraft Manufacturing Co: DH.2
- Aircraft Manufacturing Co: DH.3
- Aircraft Manufacturing Co: DH.4
- Aircraft Manufacturing Co: DH.5
- Aircraft Manufacturing Co: DH.6
- Aircraft Manufacturing Co: DH.9
- Aircraft Manufacturing Co (Airco)
- Aircraft Materials
- Aircraft Motor and Engineering Co
- Aircraft Operating Co
- Aircraft Patents
- Aircraft Precision
- Aircraft Production in the UK
- Aircraft Products
- Aircraft Propellers
- Aircraft Research Association
- Aircraft Research and Development Co
- Aircraft Services
- Aircraft Steel Structures
- Aircraft Torpedo Development Unit
- Aircraft Transport and Travel
- Aircraft of the Fighting Powers
- Aircraftings
- Aird Motors
- Aird and Coghill
- Aird and Leigh
- Aird and Sons
- Airdrie Iron Co
- Airdrie Market Buildings and Picture House
- Airdrie and Coatbridge Co
- Airdrie and Coatbridge Tramways
- Airds
- Aire Bridge
- Aire Communal Cemetery
- Aire Street Swing Bridge (Goole)
- Aire and Calder Bottle Co
- Aire and Calder Canal
- Aire and Calder Glass Bottle Works
- Aire and Calder Navigation
- Airedale
- Airedale Cars
- Airedale Collieries
- Airedale Epicyclic Gear Co
- Airedale Foundry
- Airedale Hematite Co
- Airedale Spring Manufacturers
- Airedale Viaduct
- Airedale car
- Airelite Blind Co
- Aireside Hematite Co
- Aireside Ironworks
- Airex
- Airex cars
- Airey, Cookson and Co
- Airfix Industries
- Airflow Developments
- Airflow Streamlines
- Airlight Aluminium Windows
- Airline Air Spares
- Airlite Trailer Co
- Airmatic
- Airmec
- Airoil-Flaregas
- Airolite
- Airostyle and Lithos
- Airpak
- Airport Catering Services
- Airports
- Airscrew-Weyroc
- Airscrew Co
- Airscrew Co and Jicwood
- Airscrew Company and Jicwood
- Airscrew Howden
- Airship Guarantee Co
- Airship Pilots Certificates - UK
- Airships
- Airside Hematite Co
- Airspares
- Airspeed
- Airspeed: Ambassador
- Airspeed: Consul
- Airspeed: Courier
- Airspeed: Ferry
- Airspeed: Horsa
- Airspeed: Oxford
- Airspeed: Tern
- Airspeed Aircraft
- Airstream
- Airtech
- Airton Engineering Co
- Airvac Ventilators
- Airvent
- Airvert
- Airwave Solutions
- Airways Union
- Airwick
- Airwork
- Airwork Engine Services
- Airwork General Trading Co
- Airwork Services
- Airwork and General Training
- Airworld Aviation Museum
- Airworthiness
- Aish and Co
- Aitchall
- Aitchesons and Brown
- Aitchison, Blair and Co
- Aitchison and Co
- Aitchison and Co. (Optical Works)
- Aitken, Allan and Co
- Aitken, Campbell and Co
- Aitken, Lilburn and Co
- Aitken, Mathie and Co
- Aitken, McNeil and Co
- Aitken and Co
- Aitken and Co (of Glasgow)
- Aitken and Mansel
- Aitken et Steele
- Aiton and Co
- Aiwa
- Aix-Noulette Communal Cemetery Extension
- Aix-la-Chapelle Steel Works
- Ajax
- Ajax-Grieb Rubber Co
- Ajax (American)
- Ajax (Cars)
- Ajax (Cleanser)
- Ajax (France)
- Ajax (Locomotive)
- Ajax (Switzerland)
- Ajax Aluminium
- Ajax Aniline Dye Manufacturing Co
- Ajax Co
- Ajax Domestic Appliance Co
- Ajax Engineering Corporation
- Ajax Machine Tool Co
- Ajax Marine Engines
- Ajax Metal Co
- Ajax Motor Manufacturers
- Ajax Precision Engineers
- Ajax Sanitary Co
- Ajax Trucks
- Ajax car
- Akabo Private Hotel
- Akai
- Akers
- Akers and Dickinson
- Akin Automation
- Akkens
- Akron
- Aktiebolaget Alpha
- Aktiebolaget Jarnvagsmateriel
- Aktiebolaget Separator
- Aktien-Gesellschaft fur Grossfilteration U.Apparatebau
- Akzo
- AkzoNobel
- Akzo Coatings
- Al Helal Shipping Co
- Alabastine Co
- Aladdin
- Aladdin Industries
- Aladdin Industries: Heaters
- Aladdin Industries: Lamps
- Aladdin Pink
- Aladdin Polish Co
- Alagoas Railway
- Alain Chartier Joly De Lotbiniere
- Alain Norman Latham Maclachlan
- Alamo
- Alamo Manufacturing Co
- Alan A. J. Hickman
- Alan A. L. Hickman
- Alan A. Morgan
- Alan Andrew Lamb Hickman
- Alan Archibald Campbell Swinton
- Alan Arnold Griffith
- Alan Atkinson
- Alan B. Anderson
- Alan B. Noakes and Son
- Alan Baker
- Alan Barcham Green
- Alan Barrett
- Alan Barry Dakers
- Alan Benjamin Catling
- Alan Blumlein
- Alan Boothman
- Alan Boulton Thompson
- Alan Boyle
- Alan Brebner
- Alan Brebner (1857- )
- Alan Brinton
- Alan C. Hess
- Alan Campbell Don
- Alan Carrick-Smith
- Alan Chaffer Farnell
- Alan Chapman Lloyd Browne
- Alan Charles Bagel
- Alan Charles Bagot
- Alan Charles Hess
- Alan Charles Hill
- Alan Cobham
- Alan Cobham Engineering
- Alan Cunningham
- Alan D. Crowhurst
- Alan Davies
- Alan Dix
- Alan Douglas
- Alan Douglas Carden
- Alan Dower Blumlein
- Alan Dunlop Foster
- Alan Dunolly
- Alan E. L. Chorlton
- Alan E. Woodman
- Alan Eastwood Fletcher
- Alan Eric Batt
- Alan Ernest Havard
- Alan Ernest Leofric Chorlton
- Alan Everest Brown
- Alan F. Hitchcock
- Alan Faraday Campbell Pollard
- Alan Francis Leslie Pollitt
- Alan Francis Pegler
- Alan Garrett Anderson
- Alan Geoffrey Fox
- Alan Good
- Alan Grant Birch
- Alan Grant Dalton
- Alan Hartree
- Alan Henry Lawrence Mount
- Alan Herbert Carnt
- Alan Herbert Reffell
- Alan Hickman
- Alan Hill
- Alan Hubert Carnt
- Alan Hudson Davies
- Alan Hughes Burgoyne
- Alan Ian Percy
- Alan J. Grant
- Alan Jensen
- Alan John Bullock
- Alan John Rayment
- Alan John Sykes
- Alan Joseph Macdonald Richardson
- Alan Keef
- Alan Kirk
- Alan L. Holme
- Alan Lawrence Westbrook
- Alan Leonard Williams
- Alan MacDougall
- Alan Mathison Turing
- Alan McAfee
- Alan McAlpin
- Alan Montagu Yeats Brown
- Alan Mount
- Alan Muntz
- Alan Muntz and Co
- Alan Murray Robrtson
- Alan Neville Banister
- Alan Oakley
- Alan Patrick McDouall