Collins DSII Pulmonary Function Testing System, circa 1980.
http://www.museevirtuel-virtualmuseum.ca/Search.do?ig=on&R=IMAGES_ACPO11706&lang=en
Collins DSII Pulmonary Function Testing System, circa 1980.
http://www.museevirtuel-virtualmuseum.ca/Search.do?ig=on&R=IMAGES_ACPO11706&lang=en