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A comment on Audio Engineers Built a Shield to Deflect Police Sound Cannons. Parent comment

Re:Audio Engineers Built a Shield to Deflect Police Sound Ca... by sp332 on Wednesday June 10, 2020 @04:15PM (#23481553)
I was getting this confused with a different tech then. https://www.youtube.com/watch?v=HF9G9M0cR0E&t=170
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