For further information on Hoover machines, and vacuum cleaners in general, you may wish to give the following sites a visit:
Click the image below to visit The Vintage Hoover Emporium's YouTube channel:
The Classic Hoover Emporium - Covers later Hoover cleaners. Although this site shares a similar template to mine, it is entirely run and maintained by my friend Clark, and I have had no part in its creation. All credit for the hard work that has gone into it must go to Clark!