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How a Polio Outbreak in Copenhagen Led to the Invention of the Ventilator | Innovation | Smithsonian Magazine
![household, household appliances, desk ventilator VEM, produced by unknown, product of the VEM (Volkseigener Maschinenbau der DDR), GDR, 1970s Stock Photo - Alamy household, household appliances, desk ventilator VEM, produced by unknown, product of the VEM (Volkseigener Maschinenbau der DDR), GDR, 1970s Stock Photo - Alamy](https://c8.alamy.com/comp/AYNCAJ/household-household-appliances-desk-ventilator-vem-produced-by-unknown-AYNCAJ.jpg)
household, household appliances, desk ventilator VEM, produced by unknown, product of the VEM (Volkseigener Maschinenbau der DDR), GDR, 1970s Stock Photo - Alamy
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