Face mask from apparatus for ethyl chloride or nitrous oxide anaesthesia, English, 1866-1919 Face mask for anaesthetic 1866-1919
Face mask and regulator from Clover's "Portable Regulating Ether Inhaler", English, 1877-1920 Face mask and regulator from Clover's "Portable Regulating Ether Inhaler" 1877-1920
Face mask and stop-cock from apparatus for ethyl chloride or nitrous oxide anaesthesia, English, 1866-1919 Face mask and stop-cock for anaesthetic 1866-1919
Face mask and stopcock from "Somnoform Inhaler, No. 2, Ideal Improved", England, 1871-1920 Face mask and stopcock from "Somnoform Inhaler 1871-1920