Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4974918 | Device with oscillating mirrors for deviating electromagnetic beams A device for deviating an electromagnetic beam. The device includes a mirror for reflecting the electromagnetic beam; and first, second and third magnets for generating a magnetic field. The second magnet is located between the first and third magnets. Th... | 12/04/1990 |