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A comment on An “acoustic metamaterial” that can cancel 94 percent of sound. Parent comment

Re:An “acoustic metamaterial” that can cancel 94 percent of ... by QuantumGood on Sunday March 10, 2019 @01:04AM (#19350622)
I've had these for a year and like them: Professional Safety Ear Muffs by Decibel Defense: amazon.com/gp/product/B01BEENYCQ/
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