The pictures below are of the portable oxygen unit that came with my 1963 Pinner Chrysler ambulance. I believe that it is the original unit to the car, since the bottle was full of masking tape, and every time the bottle was refilled, they recorded the date. This E & J unit was just about standard equipment on that I had ever worked on, with only one of the ambulances having a Emerson Resuscitator, which was much larger and heavier.