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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 3948489 | In-line mixer for fluids For the continuous mixing of fluid process materials or gases as they flow uninterrupted from a point of initial mixing to a discharge end and processed by means of intense vaporous cavitation, use is made of a resonant tube section having an entrance end... | 04/06/1976 |
| 3934673 | Vibrator systems for generating elastic waves in the earth This abstract describes vibrator systems for generating elastic waves in the earth, in which an actuator has a mechanical output drive means responsive to an electrical oscillatory signal, the drive means operates a variable volume compartiment filled wit... | 01/27/1976 |
