One of my aunts had the machine on the left that says DuoPower on the base, and Sears Kenmore on the front. Wow, i havnt seen one in over 40 years! If i remember right, the handle grip has an unusal shape, and is brown. The litle port with the flap on the back side is where the hose plugs in. She didnt have the hose tho,,but i figured out thats what it was for at the time. haha ( i would have been about 5-6 yrs old)
This would have been late 1960s, to very early 1970. She used it as her vacuum for carpets, and used a GE Swiveltop for above the floor cleaning and bare floors.
I remember the Kenmore was really fun to use,,as it made alot of noise,,and the Magicord was really great,,was probablly the first time id seen that feature on an upright. Sure wasnt anything like Gramma's Kirby DS 50!
I know my aunt got rid of the Duopower in about 1976, as bags,parts and repair were hard to come by,,they lived in a very rural area.
She replaced it with a gold Hoover Custom Convertible.
I know she still to this day has and uses the Convertible and the GE. Both have been repaired and parts replaced several times, of course. She told me once that the GE had been a wedding present in 1958,,and its still going strong!