In his interview Nick Laperle mentions a handful of names. I invite you to explore the links to those names.
Background on the company marketing the product?
Noise Clipper supplies various brands of custom made hearing protection such as Variphone, Sonomax and Noise Clipper, as well as being an accredited service provider of the “best practice” hearing Conservation program called HearingCoach. We service most of the major players in the mining industry such as Impala Platinum, Harmony Gold, Anglo Gold Ashanti and Anglo American to mention a few.