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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7518598 | Retraction mechanism of light pen Provided is a light pen comprising an elastic ejection assembly. In a retracting operation of the light pen, pressing a pushing rod into a barrel will move a pushing cylinder to compress a spring, push first teeth out of first grooves, clockwise turn the first teeth... | 04/14/2009 |
