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PDF) A comparison of the single-sided (Gen II) and double-sided (Gen I) Combat Arms Earplugs (CAE): Acoustic properties, human performance, and used acceptance.
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3M Single-Ended Combat Arms Tactical Military Ear Plugs - Generation 4.1 (NRR 8/21) - Universal Fit Shooting and Hunting Ear Plugs
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3M reaches $9M settlement with DOJ over sale of allegedly defective US Military earplugs :: WRAL.com
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