Anesthesia History and Device Timeline delivery systems. Illustrated by Chris Correll. (Fig 4)
Reference
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Smithsonian Institution Press. Ether inhaler invented by William T. G. Morton, about 1846.
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Allen & Hanburys Ltd., "A Reference List of Surgical Instruments and Medical Appliances,
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Wood Library Museum of Anesthesiology. Ohio 685 Anesthesia Machine. 2011. Retrieved by http://woodlibrarymuseum.org/museum/item/91/ohio-685-military-machine
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