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Earlier this month, Tesla filed a patent for laser beam technology which could be used to keep glass/windshields clear, as an alternative to traditional wipers. The system would first detect debris (via cameras?) then use lasers to clear the glass (i.e. "adaptively irradiate a region on the glass article by the laser beam at a calibrated pulse rate" - per the patent).

Tesla also has another open patent for an electromagnetic wiper system, filed earlier this year (Sep 2019). It uses a single wiper for the whole windshield, with tracks at the top and bottom of the windshield and electromagnets to pull the wiper back and forth - instead of traditional rotation mechanisms and arms.

https://www.cnet.com/roadshow/news/tesla-laser-windshield-wiper-patent/
 
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