When was the emergency ventilator invented?

Are you wondering when was the emergency ventilator invented sometime?

Under here I am glad to share you the information.

Machines helping patients breathe are called emergency ventilators. The earliest emergency ventilator was invented in 1928 and was known as an 'iron lung'. These emergency ventilators were used between the 1930s and 1950s by patients whose breathing muscles had been paralysed by polio.

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