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- Ping and Fairweather
- Pingault
- Pinhoe, Exeter
- Pinhoe Engineering and Foundry Co
- Pinhoe Railway Station
- Pinhoe Road, Exeter
- Pinhoe School, Exeter
- Pinin Farina
- Pininfarina
- Pininfarina, Carrozzeria
- Pininfarina, Industrie
- Pinit
- Pink Pills
- Pinkerton, Gibson and Co
- Pinking Shear Co
- Pinkney Gas Engine Co
- Pinks' Soft Drinks
- Pinkston Tramway Power House
- Pinn and Millett
- Pinnace
- Pinnacle Electronic Products
- Pinnacle Foods
- Pinner Gas Co
- Pinneys of Scotland
- Pinnock
- Pinnock Finance Co
- Pintail Sherry
- Pintsch's Electric Manufacturing Co
- Pintsch's Patent Lighting Co
- Pintsch-Bamag
- Pintschs Patent Lighting Co
- Pioneer Automobile Co
- Pioneer Co
- Pioneer Concrete Holdings
- Pioneer Cycle Co
- Pioneer Designs
- Pioneer Electric Power Co
- Pioneer Hi-Fi (GB)
- Pioneer High Fidelity (GB)
- Pioneer Mixers
- Pioneer Motor Car Co of India
- Pioneer Oil-Sealing and Moulding Co
- Pioneer Oilsealing and Moulding Co
- Pioneer Paint Co
- Pioneer Parachute Co
- Pioneer Power Co
- Pioneer Publications
- Pioneer Telephone Co
- Pioneer Telephone Manufacturing Co
- Pioneer Weston
- Pipe
- Pipe (Belgium)
- Pipe Car
- Pipe Engine
- Pipe Mill, Radcliffe
- Pipeline Constructors
- Pipeline Industries Guild
- Piper Aircraft
- Piper Boats
- Piper Cars
- Piper Electric Blind Operator
- Piraeus-Larissa Railway
- Pirelli
- Pirelli-General Cable Works
- Pirelli Construction Co
- Pirelli General
- Pirelli General Cable Works
- Pirelli and Co
- Pirie, Appleton and Co
- Pirie, Wyatt and Co
- Pirnhall Colliery
- Piroshaw Bomanjee Jeejeebhoy
- Pistons
- Pitcher and Bartlett
- Pitchers
- Pitcraft
- Pitfield Mills, Bamford
- Pither's Radiant Stoves
- Pithers Radiant Stoves
- Pitkeathly
- Pitkin Pictorials
- Pitkin and Short
- Pitler and Co
- Pitlochry Motor Co
- Pitlochry New Gas Light Co
- Pitlochry Power Station
- Pitlochry Railway Station
- Pitman's Central College
- Pitman's Press
- Pitman-Moore
- Pitman College of Journalism and Authorship
- Pitman Correspondence College
- Pitnall Tramway Bridge
- Pitney Rolling Mills
- Pitrie
- Pitstone Green Museum
- Pitt
- Pitt's Machine Co
- Pitt's Yorkshire Machine Co
- Pitt-Rivers Museum
- Pitt Brothers
- Pitt Engineering Co
- Pitt Moto-Caravan
- Pitt Rivers Museum
- Pitt Trailers
- Pitt and Scott
- Pitter's Patents
- Pitter's Ventilating and Engineering Co
- Pitter Gauge and Precision Tool Co
- Pitter Gauge and Tool Co
- Pittrail
- Pittsburg
- Pittsburg Reduction Co
- Pittsburgh-Des Moines Steel Co
- Pittsburgh Bridge, USA
- Pittsburgh Locomotive Works
- Pittsburgh Locomotive and Car Works
- Pittsburgh Plate Glass Co
- Pittsburgh Reduction Co
- Pittsfield Spark Coil Co
- Pivot
- Pivot Cars
- Pixie Products
- Pixon Food Products
- Plaissetty Mantle Syndicate
- Plambeck and Darkin
- Plan Copying Services
- Planahome
- Planers (Huddersfield)
- Planes
- Planet
- Planet Electric Co
- Planet Foundry Co
- Planet Junior
- Planiflex
- Plannair
- Planned Maintenance Engineering
- Plant, Green and Manton
- Plant Brothers
- Plant Engineering Co
- Plant Engineering Services (Exeter)
- Plant Heating Units
- Plant Protection
- Plant Safety
- Plant and Co
- Plant and Fisher
- Plant and Green
- Plant and Hancock
- Plant and Machinery
- Plantation Mill, Bacup
- Plantation Mill, Blackburn
- Plantation Mill, Haslingden
- Plantation Mills, Accrington
- Planters Engineering Co
- Plantin-Moretus Museum
- Plantoids
- Plas Kynaston
- Plascoat International
- Plasgoods
- Plasmar
- Plasmec
- Plasmon
- Plasmon Tea Rooms
- Plasser and Theurer
- Plastahide (Coverings)
- Plastek UK
- Plaster Decoration Co
- Plaster Products (Greenhithe)
- Plastic Adhesive Numerals
- Plastic Building Materials
- Plastic Coatings
- Plastic Constructions
- Plastic Decoration and Papier Mache Co
- Plastic Engineers
- Plastic Fashions
- Plastic Moulders (Yorkshire)
- Plastic Packaging
- Plastic Pulpware
- Plastic Rotational Mouldings
- Plastic Spray
- Plastic and Metal Engraving Co
- Plasticable
- Plasticised Expanding Wire Products
- Plastics (Fareham)
- Plastics Conduits
- Plastics Institute
- Plastics and Resins
- Plastics and Rubber Institute
- Plastics and Rubber Machinery Co
- Plastifilm Products
- Plastikade
- Plastikit
- Plastilume Products
- Plastocraft Products (Darwen)
- Plastoid
- Plastomatic
- Plastona
- Plate Girder Foot-Bridge
- Plate Steamship Co
- Plater and Co
- Platers and Stampers
- Platex Co
- Platfold Mill, Leigh
- Platignum
- Plating Co
- Platinotype Co
- Platinum Watch Case Co
- Platon Flow Controls
- Platon International
- Platow and Co
- Platow and Fergus
- Platt, Richardson and Holland
- Platt Brothers
- Platt Brothers and Co
- Platt Garage
- Platt Lane Colliery
- Platt Lane Manufacturing Co
- Platt Malleable Castings
- Platt and Schiele
- Platt and Whitehead
- Platts Forgings
- Platts Split Packing Co
- Platts and Beard
- Plauen Viaduct
- Plax
- Plaxine Co
- Plaxton
- Plaxton's
- Plaxtons (GB)
- Plaxtons (Scarborough)
- Player's Motors
- Player's No 3
- Player, Mitchell and Breeden
- Player Brothers
- Player Mitchell and Breeden
- Player and Mitchell
- Playford Reynolds
- Playtex
- Playtime Ware
- Playtime Wear
- Playway Co
- Plaza, Brussels
- Plaza Athenee, Paris
- Plaza Cinema, Exeter
- Plaza Hosiery
- Plean Colliery Co
- Pleasley Colliery
- Pleasley Pit
- Pleasure and Commercial Motors
- Pleck Foundry Co
- Plenmeller Colliery
- Plenty
- Plenty and Co
- Plenty and Pain
- Plenty and Son
- Plessey Aerospace
- Plessey Airports
- Plessey Automation Group
- Plessey Avionics and Communications
- Plessey Capacitors
- Plessey Circuits
- Plessey Co
- Plessey Components Group
- Plessey Connectors
- Plessey Controls
- Plessey Crypto
- Plessey Defence Systems
- Plessey Displays
- Plessey Dynamics Group
- Plessey Electronic Systems
- Plessey Electronics Group
- Plessey Engineering and Components
- Plessey Interconnect
- Plessey International
- Plessey Materials
- Plessey Microsystems
- Plessey Mouldings
- Plessey Navaids
- Plessey Naval Systems
- Plessey Nucleonics
- Plessey Parker
- Plessey Power Systems
- Plessey Product Assessment Laboratories
- Plessey Radar
- Plessey Resistors
- Plessey Semiconductors
- Plessey Sheet Metal
- Plessey Spares
- Plessey Switches
- Plessey Telecommunications
- Plessey Telecommunications and Office Systems
- Plessey Three-Five Group
- Plessey Wiring Systems
- Plessey Wound Components
- Pleuger and Co
- Plexeal
- Pleyel, Lyon and Co
- Pleyel, Wolff and Co
- Plimley and Co
- Plimmon Henry Dudley
- Plimpton Engineering Co
- Plimpton Horse Nail Co
- Plimsoline Products
- Plimsoll Pipes
- Plint and Partners
- Pliovene
- Ploegsteert Memorial
- Plotino Soares
- Plough Inn and Spirit Vaults
- Ploughs, Chaff Cutters and Steam Engines - Ken Redmore
- Plow Products
- Plow Products (Plastics)
- Plowden and Thompson
- Plowman
- Plowman and Brewster
- Plowman and Son
- Plowright Brothers
- Plum Mill
- Plum Mill, Heywood
- Plumber and Decorator
- Plumber and Journal of Heating
- Plume Motor Spirit
- Plume of Feathers, Exeter
- Plumett
- Pluperfect Refrigeration Co
- Plurrenden Herd
- Plus-Gas Generator Co
- Plus-Power Engine
- Plus Gas Co
- Plus Power Engine Co
- Plus Products
- Plushpile Carpet Co
- Pluto
- Pluto Stoker Co
- Pluton Car
- Plutonic Cement Co
- Plutte, Scheele and Co
- Plutte Scheele and Co
- Pluvex
- Plyant Cycle Co
- Plybestos
- Plycar Co
- Plyglass
- Plym Valley Railway
- Plymouth