sentences:  Canadair Aircraft Ltd. took over the Canadian Vickers Ltd. operations on 11 November 1944.Besides the existing Consolidated PBY Canso flying patrol boats in production, a development contract to produce a new variant of the Douglas DC-4 transport was still in effect.The new Canadair DC-4M powered by Rolls-Royce Merlin engines mounted in Rolls-Royce Universal Power Plant (UPP) installations emerged in 1946 as the "North Star."