Thanks for visiting Vacuumland and for making your vintage vacuum cleaners available to someone else rather than tossing them. You're correct, with some cleaning and lubricating both are likely still usable and apt performers.
The Model 29 was manufactured from 1950 to 1953, and the Model U4303 was manufactured circa 1980 to 1984.
Both are mid-level cleaners. Complete sets of attachments and the users guides are appreciated especially by collectors.
Best
