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Title: [Go to resource]
Description: Face mask, regulating stopcock and mixing chamber from Hewitt's improved apparatus for nitrous oxide and oxygen, anaesthesia, made by Barth and Co., English, 1894-1930 License: http://creativecommons.org/licenses/by-nc-sa/2.5/ Subjects: inhalers Temporal: 1894-1930 Source: Science Museum Identifier: A625500 Go to resource More Like this...
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