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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5610072 | Detection of caffeine in beverages The caffeine content of a beverage is measured by inserting a dipstick into the beverage. The dipstick is impregnated with a reagent that changes color when reacted with caffeine. The degree of color change will be proportional to the concentration of caf... | 03/11/1997 |
