The mask design — which filters inhaled and exhaled air with a nonproprietary material “stored inside two disc-shaped cases,” according to a release from Sandia labs — is still in testing.…
Source: The Business Journal

The mask design — which filters inhaled and exhaled air with a nonproprietary material “stored inside two disc-shaped cases,” according to a release from Sandia labs — is still in testing.…
Source: The Business Journal