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| 1930 || || Brian Sword introduces the circle absorption system.<ref name="History of Anesthesia"/> ||
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| 1932 || Organization || The Association of anaesthetists of Great Britain and Ireland is formed.<ref name="History of anaesthesia"/> || {{w|United Kingdom}}, {{w|Ireland}}
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| 1934 || Drug || {{w|Thiopentone}} is popularizedintroduced into clinical use.<ref>{{cite book |last1=Webster |first1=Nigel R. |last2=Galley |first2=Helen F. |title=Landmark Papers in Anaesthesia |url=https://books.google.com.ar/books?id=cTxoAgAAQBAJ&pg=PA73&dq=%22in+1934%22+%22Thiopentone%22&hl=en&sa=X&ved=0ahUKEwjlmJCvl7vdAhWCFZAKHR6MD1IQ6AEIOTAD#v=onepage&q=%22in%201934%22%20%22Thiopentone%22&f=false}}</ref><ref>{{cite book |last1=Agasti |first1=TK |title=Textbook of Anesthesia for Postgraduates |url=https://books.google.com.ar/books?id=f2YOpCMNFD4C&pg=PA342&dq=%22in+1934%22+%22Thiopentone%22&hl=en&sa=X&ved=0ahUKEwjlmJCvl7vdAhWCFZAKHR6MD1IQ6AEINDAC#v=onepage&q=%22in%201934%22%20%22Thiopentone%22&f=false}}</ref><ref>{{cite web |title=Thiopentone anaphylaxis |url=https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2044.1967.tb02730.x |website=onlinelibrary.wiley.com |accessdate=14 September 2018}}</ref><ref name="History of anaesthesia"/> ||{{w|United States}}
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| 1935 || Field development || The first diploma in anesthesia in {{w|England}} is awarded.<ref name="A Dictionary of the History of Medicine"/> || {{w|United Kingdom}}
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| 1942 || Drug || Muscle relaxants are introduced.<ref name="History of anaesthesia"/> ||
