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In the early 80's I worked in the Aussie mines on compressed air driven rock drills on tracks. 1050 cfm air compressors drove them. The whole box and dice was horrifically noisy. Those of us that...

3M bought up Peltor.

They are the same thing.

Yep, these are what I now wear. Slimmer than the big Peltor dark green jobbies, and seem to have more clamping force to keep noise from sneaking in around the sides.