Gem Dry Plate Co
of Cricklewood, London, NW2. Telephone: Willesden 0164. Cables: "Chemitype, Crickle, London". (1929)
1895 Company established.
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.
1929 Advert for Photographic Film, Plates and Papers. Flat Films, Roll Films, Film Packs, X-Ray Plates, X-Ray Double-coated Films, Stripping Plates, Rapid Glazing Solution, Safelights, Light Filters. "Makers of the renowned Salon Plates and Films". (Photographic Section - Stand No. O.44) 
Sources of Information
- 1929 British Industries Fair Advert 102; and p66
-  The London Project