Primary source: www.woodlibrarymuseum.org/museum/wright-peak-flowmeter/
Verified locator: Primary collection record, accession 1998-02-25-1, access key apoq. Catalogue author explicitly Wright, B.M. (Basil Martin). Object description identifies the Airmed portable peak-flow instrument and its role in moving measurements outside a bulky laboratory setup. No exact date assigned to the museum specimen from its tentative early-1960s dating.
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