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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 7366224 | System and method for the detection of presence of a signal and its synchronization, for a frequency hopping system working in a disturbed environment A method and device are disclosed for the detection and synchronization of a signal in a frequency-hopping system. The method has a step, for each frequency F(1) . . . F(M), of selecting the K samples corresponding to the greatest values of the signal, and th... | 04/29/2008 |
| 7218699 | Frequency divider A divider to divide a frequency Fe comprises at least the following elements: three flip-flop circuits, each of the flip-flop circuits receiving the frequency to be divided, every feedback loop between an output of a flip-flop circuit and its input or the... | 05/15/2007 |
