November, 18. President of Tatarstan R.N.Minnikhanov has left for Silicon Valley (USA) with working visit. Silicon Valley is a region in California State famous for a large number of high-tech companies which are engaged into elaborations and production of computers and their components, particularly microprocessors, software, mobile communication devices, biotechnologies. Original English of the valley originates from using silicon as a semi-conductor in production of microprocessors. This was the industry which gave rise to the history of valley as technological centre.