Charles Verdin model spirometer with dials calibrated in centilitres, litres and decalitres, by Boulittle, 7 rue Linne, Paris, France, 1880-1930. Charles Verdin model spirometer with dials calibrated in centilitres 1880-1903
'Thorascope' fluoroscopic x-ray unit by General Radiological Ltd., 15/18 Clipstone Street, Great Portland Street, London, W1, England, 1945-1962. 'Thorascope' fluoroscopic x-ray unit 1945-1962