>A reanimation device consists of a reanimation bag which is placed on the chest of the patient and which has a tube connected to the lungs of the patient, e.g. by a mouthpiece. When the bag is compressed heart massage may be effected through the bag by the operator. Thus, a single person may carry out resuscitation and heart massage alternately.
I think the idea is that you perform chest compressions and pump a bellows at the same time with the same motion so you don't need a second person to breathe air into them. Just a guess.
https://patents.google.com/patent/US3882860A/en
Just something I found on google, not sure if this is 100 percent accurate, but it sounds like a manual, limited use heart/lung machine.