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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6922691 | Method and apparatus for digital media management, retrieval, and collaboration A system has first and second metadata streams with respect to a video stream, the first metadata stream time-coded with respect to the video stream and the second metadata stream not time-coded with respect to the video stream. The the second metadata stream is ali... | 07/26/2005 |
