OKI began producing and supplying business machines such as Teletypewriters, and perforation typewriters. Punched tape was used as a way of storing messages for teletypewriters. There were also three teletypewriters with encoding machines. Devices like plotters and teletypewriters were commonly used instead of video display screens. Later period's teletypewriters and an original telex machine is on exhibit as well. Early teletypewriters used the ITA-1 Baudot code, a five-bit code. In 1923 it introduced teletypewriters to link its branches. The original DTEs were electromechanical teletypewriters, and the original DCEs were (usually) modems.