ohta jidosha seizosho co., ltd. was founded in ōmori, ōta, tokyo by hiro ōta. his son, yuichi ōta, later became design director for the company. in 1922, the company produced a prototype, called the ohta model os. auto production started in 1934 with the car powered by a 736 cc 4-cylinder engine. the ohta model oc was built in 1936, and the ohta model od was produced from 1937 to 1939. the company changed its name to (high speed engine industry) in 1935, and then to in 1947.