Another mechanical line composition machine called the "Teletypewriter" was invented in 1913.
This machine could be attached directly to a Linotype or similar machines to control composition by means of a
perforated tape. The tape was punched on a separate keyboard unit. A tape-reader translated the punched code
into electrical signals that could be sent by wire to tape-punching units in many cities simultaneously. These
duplicate tapes were used to operate line-casting machines like the Linotype.