Face mask and regulator from Hewitt's modification of Clover's Portable Regulating Ether Inhaler"

Made:
1877-1920 in London
maker:
Allen & Hanburys Limited
modifier:
Frederic William Hewitt

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