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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4123921 | Dyeing system Annular shaped packages of yarn and the like are draped about a pair of rolls rotatable about horizontal axes. The rolls are moved apart to apply tension to the package, and a squeeze roll is urged toward one of the other rolls and against the package. On... | 11/07/1978 |
