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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 5913629 | Writing implement including an input stylus A stylus tip for inputting information into electronic devices is provided on the writing end of a writing implement so that the operator can quickly and easily switch between writing with an ink tip cartridge to input information with the stylus tip with... | 06/22/1999 |
