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Tesla tech:
“In his patent No. 787,412, filed May 16, 1900, Tesla showed that the current of his transmitter passed over the earth’s surface with a speed of 292,830 miles per second, while radio waves proceed with the velocity of light. Tesla holds, however, that our present “radio” waves are not true Hertzian waves, but really sound waves.
He informs me, further, that he knows of speeds several times greater than that of light, and that he has designed apparatus with which be expects to project so-called electrons with a speed equal to twice that of light.”
https://teslauniverse.com/nikola-tesla/articles/faster-light