Vacbear did you see what I saw? A ranger-style senior (an exclusive to our Co-Op stores I believe) is pictured next to the much later style, the sort which went on to become Powerplus. There were many years difference between these style. As was there between the U1012 Junior and the U1104 which replaced the U1036. It is amazing how many models Hoover kept building long after the model had been replaced.
Also did you see both styles of Freedom electronic? The orange model is of a very old design, just like the standard 750 above it, but retaining the foot pedals next to the rear wheels.