Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4449268 | Caster wheel brake having an overcenter latch A caster wherein a brake plate is supported for pivotal movement about an axis intermediate the opposite ends of the brake plate and adjacent the caster yoke and beneath the caster yoke. One end of the brake plate is connected to a toggle mechanism includ... | 05/22/1984 |