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The television receiver of the black-and-white image "TM-VEI" was released in the middle of 1931 in the All-Union Electrotechnical Institute. It was the first domestic mechanical TV with a 30-line Nipkov disc designed in the VEI laboratory. After this TV, VEI and many organizations related to radio have developed about two dozen similar TVs, some of which are mentioned on the site, and some have been produced by experimental series or as sets for self-assembly of radio-TV amateurs.