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- Joel P. Heacock
- Joel Parker
- Joel Parker and Charles F. Dolby
- Joel Spiller
- Joel Spiller (of Bridgwater)
- Joel Wilson
- Joh. C. Tecklenborg
- Joh. Casp. Post Sohne
- Joh. v/h. J. Schyfsma Steenkist
- Johan August Brinell
- Johan Frederick Van Der Westhingzen
- Johan Gustav Wiborgh
- Johan Maritz
- Johan Sarvaas
- Johan Theodor Salvesen
- Johan Viggo Sigvald Muller
- Johan Willem Jacob Baron van Haersolte Van Haerst
- Johann August Daniel Oertling
- Johann Auguste Diedrich Bornemann
- Johann Conrad Fischer
- Johann Faber
- Johann Georg Bodmer
- Johann Georg Fellwock
- Johann George Halske
- Johann Gotlob Seyrig
- Johann Herbert Waring
- Johann Mannhardt
- Johann Oser
- Johann Puppe
- Johann Stumpf
- Johann Tenner
- Johann van Toll
- Johannes Andreas Prior
- Johannes Schuil
- Johannes Van Toll
- Johannis
- Johannisthal Aerodrome, Berlin
- John, Richard and J. jun Sherwood
- John-Baptist Robert Green
- John. E. Sweet
- John A. Beard
- John A. Bertram and Co
- John A. Bremner and Co
- John A. Brodie
- John A. Buttery
- John A. C. Blue
- John A. Coffey
- John A. Dahlgren
- John A. E. Cunninghame
- John A. Fransen
- John A. Grant and Co
- John A. Grey and Partners
- John A. H. Bampton
- John A. Hopkinson
- John A. Hunter and Co
- John A. MacLellan
- John A. Macdonald
- John A. Macintyre
- John A. Manson
- John A. Marshall
- John A. McCulloch
- John A. Molineaux
- John A. Patrick
- John A. Pinson
- John A. Prestwich and Co
- John A. Rennie
- John A. Roebling
- John A. Roebling's Sons Co
- John A. Rowe
- John A. Rudd
- John A. Smeeton
- John A. Smith
- John A. Stead
- John A. Stiles
- John A. Webb
- John A. Wood
- John A. Wyatt
- John Aaron
- John Abbot
- John Abbot and Co
- John Abbott
- John Abbott (1847-1916)
- John Abel Smith
- John Abell
- John Abraham
- John Abram
- John Acaster
- John Ackland and Co
- John Ackworthie and Co
- John Adam
- John Adam (1721-1792)
- John Adam Hilger
- John Adam Munn
- John Adams
- John Adams, junior
- John Adams (Coach Supplies)
- John Adams (of Ramsgate)
- John Adams (of Selby)
- John Adams Grant
- John Adams Webb
- John Adams and Sons
- John Adamson
- John Adcock
- John Addems Webb
- John Addenbrooke
- John Addie
- John Addison
- John Addison Birkbeck
- John Addy
- John Addy (1798-1876)
- John Addy and Son
- John Adolph Mowle
- John Adolph Sargrove
- John Adolphus Koosen
- John Adrian Chamier
- John Adshead
- John Adsley Oriel Addis
- John Adye
- John Aickman
- John Aidan Hastings Gott
- John Aidan Liddell
- John Aiken Salmon
- John Ainscow and Co
- John Aird
- John Aird (1800-1876)
- John Aird (1833-1911)
- John Aird (1861-1934)
- John Aird (d.1934)
- John Aird and Co
- John Aird and Sons
- John Aitken
- John Aitken (1839-1919)
- John Aiton
- John Aiton Charnock
- John Aiton Kay
- John Aiton and Co
- John Alan Corner
- John Alan Griffiths
- John Alan Williams
- John Albert Bradburn
- John Albert Caesar Dennis
- John Albert Cole
- John Albert Hookham
- John Albert Newton Friend
- John Albert Reinhold Hildebrandt
- John Albert Ryley
- John Albert Sellick
- John Albinson, Junior
- John Alcock
- John Alcock (of Bolton)
- John Alcock Jones
- John Alden
- John Aldhelm Raikes Bromage
- John Aldred
- John Aldred (1781-1855)
- John Alexander
- John Alexander (2)
- John Alexander (d.1935)
- John Alexander Agnew
- John Alexander Binnie
- John Alexander Brodie
- John Alexander Brown
- John Alexander Butchard
- John Alexander Buttery
- John Alexander Craig Blue
- John Alexander Douglas McCurdy
- John Alexander Flewitt
- John Alexander Galloway
- John Alexander George Ross
- John Alexander Henderson
- John Alexander Holder
- John Alexander Keiller
- John Alexander Low Waddell
- John Alexander Mathews
- John Alexander McDonald
- John Alexander McLaren
- John Alexander McMullen
- John Alexander Moore
- John Alexander Pearson
- John Alexander Radcliffe
- John Alexander Ross
- John Alexander Warren
- John Alexander Whitehead
- John Alexander Young
- John Alfred Aubrey Rees
- John Alfred Booth
- John Alfred Clark
- John Alfred Craven
- John Alfred Friedenthal
- John Alfred Gee
- John Alfred Griffiths
- John Alfred Hardie
- John Alfred Longden
- John Alfred Lumb Airey
- John Alfred Morris
- John Alfred Naylor
- John Alfred Phillips
- John Alfred Prestwich
- John Alfred Satterfield Hassal
- John Alfred Smeeton
- John Alfred Taylor
- John Alfred Vaughan
- John Alfred Wills
- John Alfred Wyatt
- John Algor
- John Alker
- John Allan
- John Allan (1888-1942)
- John Allan Broun
- John Allan Mackenzie
- John Allan Rolls
- John Allan and Co (Glenpark)
- John Allan and Sons
- John Allan and Sons (of London)
- John Allcock Jones
- John Allen
- John Allen (1805-1851)
- John Allen (b.1857)
- John Allen (of Birmingham)
- John Allen (of Oxford)
- John Allen Capp
- John Allen Cecil-Wright
- John Allen Clark
- John Allen Harker
- John Allen McDonald
- John Allen Northfield
- John Allen and Sons (Oxford)
- John Alley
- John Allison
- John Allsop Clyma
- John Allsopp
- John Almond
- John Ambler
- John Ambrose Coffey
- John Ambrose Slee
- John Americus Fanshawe
- John Anderson
- John Anderson (1)
- John Anderson (1726-1796)
- John Anderson (1814-1886)
- John Anderson (1843-1916)
- John Anderson (1850-1934)
- John Anderson (1882-1958)
- John Anderson (3)
- John Anderson (4)
- John Anderson ( -1904)
- John Anderson (naval architect)
- John Anderson (of Doagh)
- John Anderson Bain
- John Anderson Kelly
- John Anderson and Co
- John Anderson and Sons
- John Anderton
- John Andrew Brichieri Colombi
- John Andrew Maitland
- John Andrew Mannell
- John Andrew Patrick
- John Andrew Simpson
- John Andrews
- John Angus Allan Morrison
- John Angus Hay
- John Annan
- John Ansdell
- John Anslow
- John Anstice
- John Anstie
- John Anstif
- John Anthony
- John Anthony Clark
- John Anthony Kendrew
- John Anthony Sydney Ritson
- John Anton Hartness
- John Antony Fletcher
- John Appleton and Sons
- John Apsey
- John Arbuthnot Fisher
- John Archbold
- John Archbutt and Sons
- John Archer
- John Archer Smith
- John Archibald Forrester
- John Archibald Gray
- John Archibald Kenrick
- John Archibald Lucas
- John Archibald Polwhele
- John Archibald Purves
- John Ariger
- John Armitage
- John Armour Brown
- John Armstrong
- John Armstrong (1674-1742)
- John Armstrong (d.1758)
- John Armstrong (of Sunderland)
- John Armstrong (of Wilton)
- John Armstrong Drexel
- John Armstrong Haswell
- John Armstrong Snowden
- John Armstrong Snowdon
- John Armstrong and Co
- John Arnold
- John Arnold (Cyclist)
- John Arnold (of Newton Moor)
- John Arnott
- John Arnott (1814–1898)
- John Arrowsmith
- John Arthur Aiton
- John Arthur Anstice
- John Arthur Berrington
- John Arthur Brabham
- John Arthur Bradwell
- John Arthur Charles Williams
- John Arthur Clements
- John Arthur Cook
- John Arthur Couche
- John Arthur Crichton
- John Arthur Haycroft Caines
- John Arthur Hoyle
- John Arthur Kenrick
- John Arthur Leslie Bryant
- John Arthur Melling
- John Arthur Paul
- John Arthur Phillips
- John Arthur Relf
- John Arthur Richards
- John Arthur Roebuck Rudge
- John Arthur Roper
- John Arthur Rowcliffe
- John Arthur Rudd
- John Arthur Saner
- John Arthur Sharp
- John Arthur Simmons
- John Arthur Stead
- John Arthur Swift
- John Arthur Thomas Crump
- John Arthur Thornton
- John Arthur Tomlinson
- John Arthur Watson Bourne
- John Arthur Wright
- John Arthur Yeadon
- John Ash
- John Ashbury
- John Ashbury (1806-1866)
- John Ashcroft and Co
- John Ashdown
- John Ashdowne