From the Independent, Long Beach, California, Oct 28, 1970, Section B, page 4. Described as an Ohio 300 costing $15,000.
From Fairbanks Daily News-Miner, Fairbanks, Alaska, Nov 27, 1964, page 3.
From the El Paso Herald-Post, El Paso, Texas, Aug 31, 1957, Section B, page 14.
From the Stroudsburgs Gazette, Stroudsburgs, Pennsylvania, Sept 11. 1963, page 3. Probably a Collins, 9-liter respirometer.
From The Gettysburg Times, Gettysburg, Pennsylvania, Dec 29, 1978, front page. Spirometer may be a Godart Pulmotest.
From The Suburbanite Economist, Chicago, Illinois, March 17, 1971, page 14. Spirometry performed at a health fair with a Jones Pulmanor spirometer.
From The Herald, Arlington Heights, Illinois, March 19, 1975. Front page section 4.
From The Iowa City Press Citizen, Jan 15, 1968, page 9.
From: Aviation medicine in the A.E.F. by William Holland Wilmer, U.S. Government Printing Office, 1920. Page 66.
From: The effect of temperature, humidity and other factors on hatch of hen’s eggs and on energy metabolism of chick embryos, by H.G. Barott. Technical Bulletin #553. March 1937. United States Department of Agriculture, page 6.
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The diverse, quirky and mostly forgotten history of Pulmonary Function testing