'Polio victims were kept alive by the 1920s invention of the tank respirator, better known as the iron this'
the iron lung
20th CENTURY INNOVATION: Polio victims were kept alive by the 1920s invention of the tank respirator, better known as the iron this
Polio victims were kept alive by the 1920s invention of the tank respirator, better known as the iron this
Polio victims were kept alive by the 1920s invention of the tank respirator, better known as the iron this
20th CENTURY INNOVATION
the iron lung
20th CENTURY INNOVATION