This was reported back in 2016

This was reported back in 2016

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https://everydayconcerned.net/2016/11/10/dave-case-electronic-engineer-invents-an-electronic-counter-measure-for-high-frequency-ringing-in-ears-or-tinnitus/
https://everydayconcerned.net/2016/11/10/dave-case-electronic-engineer-invents-an-electronic-counter-measure-for-high-frequency-ringing-in-ears-or-tinnitus/