1) Mechanical ventilation
Found on
https://www.crosswordclues.com/clue/both-respirator
The Both respirator, also known as the Both Portable Cabinet Respirator, was a negative pressure ventilator (more commonly known as an `iron lung`) invented by Edward Both in 1937. Made from plywood, the respirator was an affordable alternative to the more expensive designs that had been used prior to its development, and accordingly came into c.....
Found on
http://en.wikipedia.org/wiki/Both_respirator
No exact match found.
