![France's Jean Gachassin, newly-elected President of the French Tennis Federation (FFT), attends a news conference in Paris Febraury 8, 2009. REUTERS/Christophe Saidi (FRANCE Stock Photo - Alamy France's Jean Gachassin, newly-elected President of the French Tennis Federation (FFT), attends a news conference in Paris Febraury 8, 2009. REUTERS/Christophe Saidi (FRANCE Stock Photo - Alamy](https://c8.alamy.com/comp/2E78FKE/frances-jean-gachassin-newly-elected-president-of-the-french-tennis-federation-fft-attends-a-news-conference-in-paris-febraury-8-2009-reuterschristophe-saidi-france-2E78FKE.jpg)
France's Jean Gachassin, newly-elected President of the French Tennis Federation (FFT), attends a news conference in Paris Febraury 8, 2009. REUTERS/Christophe Saidi (FRANCE Stock Photo - Alamy
![Example of fft of the vibration signal of a tennis racket (~134 Hz).... | Download Scientific Diagram Example of fft of the vibration signal of a tennis racket (~134 Hz).... | Download Scientific Diagram](https://www.researchgate.net/publication/336630302/figure/fig2/AS:815172566384641@1571363693500/Example-of-fft-of-the-vibration-signal-of-a-tennis-racket-134-Hz-Large-yellow-dots.png)
Example of fft of the vibration signal of a tennis racket (~134 Hz).... | Download Scientific Diagram
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