Components of the system were developed separately on several types of aircraft, including the Lancaster, Viking, Devon and the Albemarle. A demonstration of the techniques used was given to military and government representatives in May 1949.[19] By 1950 the entire system had been installed on a DH Devon and the first demonstration of Autoland was given on that aircraft on 3 July 1950.[20] Over the next 20 years, BLEU in conjunction with UK industry and the UK airworthiness authority, was responsible for almost all of the pioneering work needed to convert the concept of those experimental demonstrations into safe, accurate blind landings by large transport aircraft.[21] The system in use during the early 2000s is basically the same as that used experimentally in 1950. The following diagram, from J S Shayler's 1958 memorandum, shows how the different components of the system, and guidance signals, were used during the consecutive phases of an automatic landing.