Russian culture jet Tupolev Tu-144 by Alexei Tupolev, MiG fighter aircraft series by Artem Mikoyan and Mikhail Gurevich, and Su series by Pavel Sukhoi and his followers. MiG-15 is the world's most produced jet aircraft in history, while MiG-21 is most produced supersonic aircraft. During World War II era Bereznyak-Isayev BI-1 was introduced as the first rocket-powered fighter aircraft, and Ilyushin Il-2 bomber became the most produced military aircraft in history. Polikarpov Po-2 "Kukuruznik" is the world's most produced biplane, and Mil Mi-8 is the most produced helicopter. Famous Russian battle tanks include T-34, the best tank design of World War II,
Sukhoi Log mine and political problems delayed progress. Sukhoi Log was the subject of a special hearing held by the State Duma's Security Committee under the watchful gaze of hardline communist Viktor Ilyukhin to investigate threats to Russia's national security from this "shadowy" Australian company. The Australian company wrote off $127 million on the failed venture after Russian courts overturned decisions by Russian politicians. The majority of gold was imputed during diagenesis and early metamorphism. After the majority of the gold input was finished, many large scale tectonic and geological events have occurred. Such event ages obtained by the monazite, Rb–Sr, and paleomagnetic