 This somehow contradicts partially with the official history of the institute (now the All-Russian Scientific Research Institute Of Technical Physics); the official history stated that the Ministry of Medium Engineering of the USSR order concerning the creation of a corresponding research institute was not signed until 5 April 1955, with design work starting a few months later.But in any case, there existed a common (but entirely false) myth that the Tsar Bomba was designed per personal order from Nikita Khrushchev with a total research and development time of only 112 days; the actual development of the final stage of the Tsar Bomba (then already placed in KB-11, now the All-Russian Scientific Research Institute of Experimental Physics) did indeed take 112 days.The Tsar Bomba differs from its parent design – the RN202 – in several places.