Spirometer, Dargatz-Knipping, Model 210D, circa 1970

Although not labeled in the text, this is a Dargatz Model 210D Knipping spirometer and was used for exercise testing. From “Lung function tests. Methods and examples. Clinical application.” By H. Bartels , E. Buchner , CW Hertz , G. Rodewald , M. Schwab. Published by Springer-Verlag, 2013, page 33.

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