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https://en.wikipedia.org/wiki/Teleforce
>Tesla Teleforce
Teleforce was a proposed defensive weapon by Nikola Tesla that accelerated pellets or slugs of material to a high velocity inside a vacuum chamber via electrostatic repulsion and then fired them out of aimed nozzles at intended targets. Tesla claimed to have conceived of it after studying the Van de Graaff generator.[1][2] Tesla described the weapon as being able to be used against ground-based infantry or for anti-aircraft purposes