That would have been Singer and or Bissell.By the time the Vax appeared Sears had appliances with their original brand names.Some would be Sears only models as with at least one Hoover and a Eureka canister.
At one time I had a vax upright bagless in a pretty orange color come in my shop on a trade. I eventually sold it. I swear it was basically the same thing as the Bosh upright