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Telegram from Thessaloniki to Piraeus typed according to the multiple Baudot system which was installed in the Athens-Thessaloniki line in 1922. The French Baudot invented the multiplexing of 2-9 lines in the same circuit and the keyboard with 5 keys in line with a person's five fingers. Baudot's multiple system was installed in the Athens-Thessaloniki line in 1922 and had a transmission data rate of up to 360 letters per minute. .