Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 4318008 | Random power controller The frequency of a reference oscillator is controlled by a reference voltage which is altered at the beginning of an output cycle to equal the instantaneous value of the averaged outputs of a first oscillator and a second oscillator. In a preferred embodi... | 03/02/1982 |