<https://www.ohscanada.com/products/bilsomr-incorporates-exclusive-air-flow-controltm-technology-into-thunderr-and-leightningr-earmuff-lines/#webpage>
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"-- Patented AFC technology improves attenuation-- New design offers convenience of snap-in ear cushionsSmithfield, RI -- Beginning in January 2005, all"
<https://www.ohscanada.com/products/bilsomr-incorporates-exclusive-air-flow-controltm-technology-into-thunderr-and-leightningr-earmuff-lines/>