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Pneumotach based. Probably manufactured in the 1980’s. From:

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Even though I was feeling better when I came back my spirometry results were over 10% down (I was doing weekly QC on myself) and it took a couple weeks before they got back to my normal values.

Jul 19, 2017 · From an undated photo. Gasometer style indicates it’s from 1920’s.

Mar 14, 2016 · These measurements were in somewhat common use for the first decades of modern spirometry. They have since mostly passed into disuse and have largely been forgotten either …