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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4162552 | Cleaning device for circular discs A cleaning device for a circular disc with a central bore, the device hav a shaft on a supporting box to rotatably hold a disc to be cleaned in a cleaning tank, and a drying rack which fits into the box and on which the disc can be dried; there is furthe... | 07/31/1979 |
