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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
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