21. Groups of five or seven bits become a character printed by a teleprinter . 22. Output was to either a Creed teleprinter or to a paper tape punch. 23. Most teleprinters operated at ten characters per second although a few achieved 15 CPS. 24. The Teletype or teleprinter is an electronic device. 25. Connecting the various sites was an enormous network of telephones, modems and teleprinters . 26. Message centers had rows of teleprinters and large racks for paper tapes awaiting transmission. 27. Tropospheric-scatter voice and teleprinter communications between missile firing units and higher headquarters. 28. He significantly contributed to the development of teleprinters . 29. Communication with Bletchley Park was by teleprinter links. 30. Messages would then automatically be routed back out via teleprinter with instructions on them.