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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7578138 | Heat exchanger optimization process and apparatus An electronic HEMD determines the optimum balance between gas cooling and heat exchanger pressure loss, for any given operating condition, and adjusts the gas flow rate through the exchanger accordingly, to yield the maximum net power savings (and thereby energy sav... | 08/25/2009 |
| 5871849 | Wood substitute turning blank and method of making the same A wood substitute turning blank and method of making the same is described. The turning blank includes a body having an outer shell of relatively low tensile strength material positioned about a rotational axis of the body. An inner core of relatively hig... | 02/16/1999 |
