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The 425 was the only upright from Hoover to use this design...the model 450 after it was more "conventional" which leads me to believe that they had trouble with the 425 design. It could be too that it was more economical to make the design uniform across the line. The round belt configuration could have been more efficient too...these are just some of my thoughts on why the flat belt disappeared so soon.--Tom
The 425 was the only upright from Hoover to use this design...the model 450 after it was more "conventional" which leads me to believe that they had trouble with the 425 design. It could be too that it was more economical to make the design uniform across the line. The round belt configuration could have been more efficient too...these are just some of my thoughts on why the flat belt disappeared so soon.
--Tom