The Meyer Snow Plow brochure includes a large section about the ElectroLift. Labeled form no. 3-163, the brochure is a standard paper side with a half-paper-sized section that folds out horizontally to reveal more details about the Electrolift. There is not date on this brochure, but I’d guess early 1960s.
Note that the left side of the back of this brochure is the same as the image above. It’s the right side that folds out.