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A 19th century Squire's Inhaler.
On the 21st of December 1846, 36 year old Frederick Churchill had has leg amputated by Robert Liston at the University College Hospital in London. This was the first operation to be carried out under anaethesia in the UK. Liston's assistant, Dr William Squire designed this inhaler after the operation was a success. This was one of the first purpose built inhalers.