Spirometer, Stead-Wells, Schematic, 1967

Stead_Wells_Spirometer_Schematic_1967

From “Pulmonary Function Testing, Principles and Practice”, by Stephen Conrad, Gary Kinasewitz and Ronald George.  Published 1984 by Churchill Livingston, page 81.  Attributed within the text as originating from a 1967 manual on Clinical Spirometry from Warren E. Collins, Co.

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