John,
Thanks to Toby - he loaned me his manual for his President tank cleaner - those were built for the State Vacuum companies in the south east. One of which is still in business in Tampa Florida.
I have a Super Chief, identical to the President, which I think was built by LF&C for a department store chain (only guessing here). Doug in Canada has examples of the same line of machines branded under a different name which escapes me at the moment.
In the cases of President and Super Chief, the tag on the bottom of the machine says "motor built by Landers, Frary and Clark. On the bottom of the Atlas, the tag reads "Manufactured by Landers, Frary and Clark. I knew for a while that they built the Atlas for the sewing machine store chain.
In the manuals for any of the above machines, Universal is never mentioned at all, and if the customer requires service or parts - they are merely instructed to see their dealer. In my Universal manuals, the trademark is present almost every other word.
Such as "insert your Universal's hose into the Universal wand with a slight twist and press the switch located on the top of your Universal with a touch of the toe"...
Rick