Imperial Dry Plate Co
of Cricklewood, London, NW2. Telephone: Willesden 4286. Cables: "Impeople, London"
1901 Maker of Imperial photographic plates and "P.O.P" (see advert)
1920 The Selo company was formed for joint R and D, and the sensitising of roll films, in Woodman Road, Brentwood, Essex, by Ilford, Imperial, Gem and a consortium of seven other UK manufacturers, that eventually took the umbrella name of Amalgamated Photographic Manufacturers.
1924 Patent - Improvements in and connected with photographic film packs or holders. 
1928 Patent - Improvements in or relating to photographic film packs. 
1929 Advert for Plates, Roll Film, Film Packs and Papers. Manufacturers of Photographic Plates, Films (including Panchromatic Roll Films and Film Packs), Photographic Papers, Light Filters, Impan and Cloud Filters, Exposure Meters and Reckoners, X-Ray Fluorescent and intensifying Screens, Duoplex X-Ray films and Plates, Negative Paper for Recording. (Photographic Section - Stand No. O.42)