Wuhan Olinzhu Mental Arithmetic Research Institute Company. According to Baidu map, Wuhan Olinzhu Mental Arithmetic Research Institute Company is an abacus, and its address is located at Room 30 1, Gate 65438, Building 5, No.35 Dingziqiao Road, Wuchang. Abacus is an auxiliary tool for manual operation and calculation. It originated in China and was an important invention in ancient China. Before Arabic numerals appeared, abacus was a widely used computing tool in the world.