A combined communicating typewriter/dictation system which utilizes a common modem as an interface between an electronic typewriter, a mass media recorder and a communications line. The modem replaces digital logic and audio tones are recorded on the mass media recorder instead of digital tones. When...http://www.google.com/patents/US4272813?utm_source=gb-gplus-sharePatent US4272813 - Communicating typewriter and dictation system utilizing analog recording and transmission techniques
