Spirometer, Collins Stead-Wells, 1968

Spirometer_Collins_Stead-Wells_1968

Collins Stead-Wells Spirometer, circa 1968.

From: Burton RM, Kozel WM, Penley RP, Ward GH, Chapman RS.  Application and evaluation of portable field instruments for measuring Forced Expiratory Volume of children and adults in environmental health surveys.  Environmental Health Perspectives, 1974; 8: 123-131.  Page 124.

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