Ailsa Craig - Albion - Associated British Oil Engine Company(ABOE Co.) - Bamford - Belliss and Morcom - Blackstone - Bradford Gas Engine Co. - British Polar Engines - Crossley - Dennis - Dorman - Douglas - Doxford - English Electric - Gardner - JAP - Jowett - Kelvin - Lister - McLaren - Meadows - Mirrlees - Mirrlees Blackstone - Napier - National Gas Engine Co. - Norton - Paxman - Pelapone - Perkins - Petter - Premier Gas Engine Co. - Russell Newbury - Ruston - Tangye & Co. - Villiers - Wolseley