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OMO was founded on June 18, 1922. It celebrated 10th Anniversary (1932), 20th Anniversary (1942), 30th Anniversary (1952), 40th Anniversary (1962), 50th Anniversary (1972), 60th Anniversary (1982), 70th Anniversary (1992) and 80th Anniversary (2002).
The new logo was introduced in 2012, celebrated OMO's 90th Anniversary. Without the 90th anniversary, the logo stills in 2013. Soon as possible, it will be celebrating OMO's 100th Anniversary in 2022.