3M EAR Classic Review and Noise Reduction Test Results
3M EAR Classic are the original foam earplugs. They were developed in the late 60s by a chemist, Ross Gardner Jr., who by accident discovered that the sealants he was working on had unusual energy-absorbing properties. The discovery of these energy absorbing resins (E-A-R) spawned off a completely new project that eventually led to the …
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