Here are photo's that show the brush roll differences. Regarding the Disturbulator, there were several different versions from its launch in 1945 with the Model D-272 according to advertisements. The first had 4 sections of 2 rows of willow brushes - one longer than the other; replaced by nylon bristles in 1949 on the Model 250. Then beater bars were added in 1972 and introduced on the models 238-FB & 2022. I'm unsure if other modifications were made after that. The Vibra-Groomer III was added to the line in 1986.
Photo 1: (from "swingette" in thread 940) - from top to bottom: helix-shaped Vibra-Groomer - introduced in 1969 with the Model 2080 "Vanguard", Disturbulator with nylon bristles, Vibra-Groomer II - introduced in 1978 with the Model 1458.
Photo 2: Disturbulator with beater bars introduced in the fall of 1972 with models 238-FB & 2022.
Photo 3: Vibra-Groomer III, launched in 1986 with the Express Power Team models 8260, 8283, 8285 & JCP's 3003; it's similar to Hoover's 'Quadraflex' brush roll with 4 brush strips.
Photo 4: New Disturbulator article from the November 15, 1945, edition of the EUGENE REGISTER-GUARD
Photo 5: June 28, 1946, NEWS-SENTINEL ad featuring the new Home Cleaning System
