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O Mootor, founded on 19 January, was a transport company operating in Tallinn from 1926 to 1940. In the 1930s, it became the largest transport company in Estonia, employing more than 300 people. According to some sources, the company was even regarded as the largest enterprise of its kind in the Baltic region, including Finland.

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The first reinforced concrete bridge in Estonia, the Tartu Freedom Bridge, opened on January 4, 1926 and was built between 1924 and 1926.