Ultraphon
Virtually from the very beginning, Ravitas, which started to operate in Czechoslovakia in 1929, released on the Ultraphon label not only records made by its parent company, Deutsche Ultraphon AG, but also, and predominantly, albums featuring original Czech music. The main shareholders and managers of Ravitas were František and Jan Valentini. At the time, other companies, including Parlophon and Odeon, were operating in Czechoslovakia, yet they could not compete for long, with the only ones that survived being The Gramophone Company, with the Columbia and His Master's Voice labels.