3M intentionally provided the military defective earplugs for about a decade. Service members used them in good faith while 3M rolled in government contract money. 3M ended up paying a multi million dollar settlement for neglect leading to hearing loss and tinnitus.
Yes, the double ended ear plugs Daft idea. I remember asking the 3M rep how they could guarantee they'd be used properly and what sort of attenuation they got out of the filter side.
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