62,682
edits
Changes
no edit summary
| 1935 || || || Facemasks are mentiones in an edition of the book ''Assistance for operating staff''.<ref name="Fangerau"/> ||
|-
| 1937 || || || "With the onset of During the {{w|Second Sino-Japanese War in 1937}}, face masks became become essential protection against chemical and biological warfare."<ref name="sixthtone.comt">{{cite web |title=A Brief History of Face Masks in China |url=https://www.sixthtone.com/news/1005177/a-brief-history-of-face-masks-in-china |website=sixthtone.com |accessdate=18 September 2020}}</ref> ||{{w|China}}
|-
| 1948–1950 || || || After a period of decline since the end of the Spanish flu, the use of face masks quickly becomes common again during several major flu outbreaks around this time.<ref name="sciencenorway.no">{{cite web |title=Face masks: Why do different countries in the world have such different recommendations? |url=https://sciencenorway.no/cultural-history-disease-health/face-masks-why-do-different-countries-in-the-world-have-such-different-recommendations/1689385 |website=sciencenorway.no |accessdate=11 September 2020}}</ref> ||
