TelAutography Teletype Teletype network Teletyping cable cablegram closed-circuit telegraphy code day letter duplex telegraphy electricity facsimile telegraph fast telegram flash interrupter key multiplex telegraphy news ticker night letter quadruplex telegraphy radio radiogram railroad telegraphy receiver send a wire sender sign off sign on simplex telegraphy single-current telegraphy sounder stock ticker submarine telegraphy telegram telegraph telegraphics telegraphy teleprinter teletypewriter teletypewriting ticker transmitter typotelegraph typotelegraphy wire wire service