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- Trefano
- Treferig Valley Railway
- Treffry Tramways
- Treffry Viaduct
- Trefor Basin Bridges
- Treforest Electrical Services
- Treforest Power Station
- Treforest Tinplate Works
- Trefusis Mine
- Tregajorran Mine
- Tregargus Valley
- Tregarn Viaduct
- Tregarne Viaduct
- Tregeagle Mine
- Tregeagle Viaduct
- Tregelles Family
- Tregelles and Fox
- Treggan and Co
- Treggon, Hickson and Co
- Treggon and Co
- Treglown
- Tregune Consols Copper and Tin Mine
- Tregwollans Iron Mine
- Trehane Lead Mine
- Trehawke Davis
- Trekka
- Trelawney Hotel
- Treleigh Consols Mine
- Trelissick Mine
- Trelleborg Rubber
- Trellech Furnace
- Treloar and Sons
- Trelonk Brickworks
- Treloweth Copper Mine
- Trelusback Mine
- Tremletts
- Tremo Mouldings
- Trenanace Viaduct
- Trenance Iron Mine
- Trenance Viaduct
- Trench Tubeless Tyre Co
- Trench Warfare Filling Factories
- Trenchard
- Trencherfield Mill
- Trencherfield Mill, Wigan
- Trencherfield Mills, Wailgate
- Trenchmann, Weekes and Co
- Trend Industrial Equipment
- Trenethick Wood Mine
- Trenham Reeks
- Trennjaeger
- Trent
- Trent, Ancholme and Grimsby Railway
- Trent Aqueduct
- Trent Bridge
- Trent Bridge, Gainsborough
- Trent Bridge, Newark
- Trent Bridge, Nottingham
- Trent Concrete
- Trent Cycle Co
- Trent Foundries
- Trent Gas Engine Co
- Trent Guns and Cartridges
- Trent Hardare and Holloware Co
- Trent Hardware and Holloware Co
- Trent Hire Cruisers
- Trent Iron Co
- Trent Iron Works
- Trent Jetfloor
- Trent Mining Co
- Trent Motor Traction
- Trent Motor Traction Co
- Trent Navigation
- Trent Navigation Co
- Trent Oil Products
- Trent Railway Bridge
- Trent Railway Station
- Trent Vale Brick and Tile Co
- Trent Valley Glassworks
- Trent Valley Railway
- Trent and Co
- Trent and Mersey Canal
- Trent and Upsdale
- Trentham Engineering Co
- Trentham Gardens Miniature Railway
- Trentham and Saunders
- Trenton Dyeing and Finishing Co
- Trenton Potteries Co
- Trenwith Mine
- Trereife Smelting House
- Treron et Cie
- Tres Palmas
- Tresavean Mine
- Tresises
- Treskerby Mine
- Tress and Co
- Trestle Viaduct, south of Pulborough
- Tresulgan Viaduct
- Trethellan Mine
- Trethowal China Clay Co
- Tretoil Mining Co
- Tretol
- Tretol-Servicised
- Trevalga Slate Quarry
- Trevaskus Mine
- Treveddoe Mining Co
- Trevelyan Mine
- Trevelyan and Co
- Treverbyn Iron Mines
- Trevido Viaduct
- Trevil Rail Road Co
- Trevithick: Replica Locomotives
- Trevithick: Surviving Engines
- Trevithick Day, Camborne
- Trevithick Genealogy
- Trevithick Memorials, St. Erth
- Trevithicks Industrial Dartford Celebration
- Trevor
- Trevor, Hopkins and Brothers
- Trevor-Johnstone Co
- Trevor Banks Lewis
- Trevor Bowman-Shaw
- Trevor Construction Co
- Trevor Cresswell Lawrence Westbrook
- Trevor Dawson
- Trevor E. Salt
- Trevor E. Williams
- Trevor Edward Peppercorn
- Trevor Edward Salt
- Trevor Hammond
- Trevor John Livesey
- Trevor Leslie Hill
- Trevor Maurice Buckley Guy
- Trevor Prince Searight
- Trevor Rapson
- Trevor School
- Trevor Seaton Davies
- Trevor Victor Knox
- Trevor White and Co
- Trevor and Clare
- Trevredyn Rashleigh Wynne
- Trevredyn Wynne
- Trew's Weir, Exeter
- Trew's Weir House, Exeter
- Trew's Weir Mills
- Trew's Weir Mills, Exeter
- Trew's Weir Paper Mills
- Treweatha Silver-Lead Mine
- Trewene United Lead Mine
- Trewhella Brothers Pty
- Trewin Brothers
- Trews Weir, Exeter
- Trews Weir Paper Mills
- Trex
- Tri-Sphere
- Tri-ang
- Trianco
- Triangle, Exeter
- Triangle Digital Services
- Triangle Products
- Triangle Valve Co
- Triangular Construction Co
- Triauto-Godet
- Tribe and Astin
- Tribet Cars
- Tricentrol Car Group
- Tricity
- Tricity Bendix
- Tricity Cookers
- Tricker's
- Trickers
- Trico-Folberth
- Trico Developments Co
- Tricolor Nitrate Co
- Tricorn Group
- Tricycles
- Tridan Engineering
- Trident
- Trident (missile)
- Trident Automotive Parts
- Trident Cars
- Trident Federated Exporters
- Trident Motor Co
- Trident Paste
- Trident Radio
- Trident Tankers
- Trident Television
- Triefus Industries
- Trier
- Trier Brothers
- Trier and Martin
- Trifast
- Triger Process
- Trigwell, Watson and Co
- Trigwell and Co
- Triking
- Triking Cars
- Trilec Instruments
- Trilox
- Trim Fashions
- Trimcraft
- Trimcraft Motor Products
- Trimguard UK
- Trimo
- Trimulgherry Cantonment Cemetery
- Trinadad and Tobago Tourist Board
- Trinculo
- Trinder, Anderson and Co
- Tring Cutting
- Trinidad Central Oil Fields
- Trinidad Estates Co
- Trinidad Government Railways
- Trinidad Leaseholds
- Trinidad and Tobago Tourist Board
- Trinity Cars
- Trinity Chain Pier
- Trinity Chair Works
- Trinity Garage Co
- Trinity Holdings
- Trinity House
- Trinity Knitwear Co
- Trinity Place, Exeter
- Trinity School, Stony Stratford
- Trinity Street, Exeter
- Trio-Kenwood
- Trionite
- Triotone
- Triotron Radio Co
- Triouleyre
- Triox Products
- Trip Recorder Co
- Tripillow
- Triple-Ess
- Triplex
- Triplex Foundries Group
- Triplex Foundry
- Triplex Holdings
- Triplex Lloyd
- Triplex Power Control
- Triplex Safety Glass
- Triplex Safety Glass Co
- Tripoli Harbour
- Tripower
- Tripp
- Trippe Lights
- Trisave Boilers
- Trist, Draper
- Trist Draper
- Tristram Edwin Harry Pitt Kennedy
- Tristram Foster Spence
- Tristram Pitt Kennedy
- Tritec Distribution
- Triton
- Triton Aquatherm
- Triton Automotive
- Triton Manufacturing Co
- Triton Showers
- Tritt Electric Co
- Triumph
- Triumph-Adler
- Triumph: 1.5-Litre
- Triumph: 1300
- Triumph: 14/60
- Triumph: 14/65
- Triumph: 1500
- Triumph: 2-Litre
- Triumph: 2.5P1
- Triumph: 2000
- Triumph: Acclaim
- Triumph: Bantam Cub
- Triumph: Cars
- Triumph: Cycles
- Triumph: Dolomite
- Triumph: GT6
- Triumph: Gloria
- Triumph: Herald
- Triumph: Junior
- Triumph: Mayflower
- Triumph: Model C
- Triumph: Model N
- Triumph: Model P
- Triumph: Motorcycles
- Triumph: Renown
- Triumph: Ricardo
- Triumph: Roadster
- Triumph: Scorpion
- Triumph: Speed Twin
- Triumph: Spitfire
- Triumph: Stag
- Triumph: T120/T140 Bonneville
- Triumph: T150/T160 Trident
- Triumph: T20 Tiger Cub
- Triumph: T21
- Triumph: TR2
- Triumph: TR3
- Triumph: TR4
- Triumph: TR5
- Triumph: TR6
- Triumph: TR6 P
- Triumph: TR7
- Triumph: TR8
- Triumph: Toledo
- Triumph: Trophy
- Triumph: Vitesse
- Triumph (Clothing)
- Triumph Auto
- Triumph Cabinet Works
- Triumph Co
- Triumph Cycle Co
- Triumph Electric Manufacturing Co
- Triumph Engineering Co
- Triumph Gloria
- Triumph Motor Club
- Triumph Motor Co
- Triumph Motor Co. (1945)
- Triumph Motor Co (1945)
- Triumph Motor Co (Liverpool)
- Triumph Motors
- Triumph Nine
- Triumph Scorpion
- Triumph Stoker
- Triumph Super Nine
- Triumphator Co
- Trivelox Gear Co
- Trix
- Trix Electrical Co
- Trix Electronics Co
- Trixale Engineering
- Trixie
- Trobike
- Troedyrhiw Coal Co
- Trois Corrones, Vevey
- Trojan
- Trojan: Bubble Cars
- Trojan: Buses
- Trojan: Cars
- Trojan: Commercial Vehicles
- Trojan: Mini-Motors
- Trojan: Motorcycles
- Trojan Vacuum Cleaner
- Trojan car
- Trolleybus Museum at Sandtoft
- Trollhattan Power Station
- Trollope and Colls
- Trollope and Sons