Blow Tester c. 1886 by Percival Everitt
Grip & Blow c. 1904 by Caille Bros. Co.
Lung Tester c. 1905 by W. H. Ell & Co.
Lung Tester c. 1914 by British Manufacturing Co.
Spirometer c. 1895 by Joseph Mason & Co.
Code updated 19th January 2026