Hewitt's adaptation of Clover's portable regulating ether inhaler, sectioned to show interior, by George Ba[....], 54 Poland Street, London, England, 1901-1930. Hewitt's adaptation of Clover's portable regulating ether inhaler 1901-1930
Face mask and regulator from Hewitt's modification of Clover's Portable Regulating Ether Inhaler", regulator made by Holborn Surgical Instrument Co., London, 1877-1920 Face mask and regulator from Hewitt's modification of Clover's Portable Regulating Ether Inhaler" 1877-1920