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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| D660282 | Digital voice recorder | 05/22/2012 |
| D576999 | Dictation recording device and docking station | 09/16/2008 |
| D509207 | Dictating machine | 09/06/2005 |
| 6167376 | Computer system with integrated telephony, handwriting and speech recognition functions A computer system with speech recognition systems and handwriting recognition systems are disclosed that work closely together to improve the total recognition accuracy of each system alone. Handwriting recognition system may include a pen/stylus input de... | 12/26/2000 |
| 4809116 | Modular dictation/transcription system having plural recording modules and a common display A dictation transcription system having two or more recording/playback modules and a display module, all of which are detachably connectable to form an integral structure. The display module provides a visual display of the length, locations and types of ... | 02/28/1989 |
