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![A battery-free wireless sensor [34, 35, 39]. | Download Scientific Diagram](https://www.researchgate.net/publication/323609534/figure/fig3/AS:695966889963520@1542942845432/A-battery-free-wireless-sensor-34-35-39.jpg "A battery-free wireless sensor [34, 35, 39]. | Download Scientific Diagram")
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