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From: NEAL LANGERMAN <neal**At_Symbol_Here**CHEMICAL-SAFETY.COM>
Subject: Re: [DCHAS-L] NIOSH Technical Report P/N 2021-107: Filtering Facepiece Respirators with an Exhalation Valve: Measurements of Filtration Efficiency to Evaluate Their Potential for Source Control
Date: Dec 13, 2020 22:10 UTC
Reply-To: neal**At_Symbol_Here**CHEMICAL-SAFETY.COM
Agree .. Waldo is a much better word. Who remembers the Heinlein story it was first used in?