The connecting linkages from the gearbox to the two layer bellows were
modified chevy front end steering parts.
The cupped bearing halves, tension springs, and tapered ball joints were difficult to find until I found "chev's of the 40's.com. who knew what I was needing and repeatedly called me over the next two and a half years to update me on their progress of finding the three ball joints needed for my friend's lung.
Unexpected wold class service fo these days and times. kudos to Chev's!

All of the collars on the iron lungs so far have been the spiral type. were there no latex foam collars with the five leather straps that held them open?
Some patients, like my friend, would be choked by the plastic spiral collar before an effective seal could be achieved and could only use the foam ones, buffered by a diaper cloth to prevent chafing, sores, or even the foam from actually growing into the skin.
I mentioned under another picture that I'm modifying her "collar buster" to open and close a spiral unit. That one now has a new fleece fabric over an inner liner to get a good seal and be comfortable as well.

P.S.
Her lung is covered with mementos and memorabilia of her life. I could'nt find a "Star Fleet " life support technitians badge at the last Trek convention in OKC, but she thougt the shuttle pilot's badge appropriate.