Original ice cream trade magazine vintage ad for DRY-ZERO CORPORATION. Main office was located at Merchandise Mart, Chicago, IL. Walker Vehicle Company built the truck for Carroll Ice Cream, as pictured. It is unique in a transverse aisle reached by a side door giving easy access to two compartments in each end. It is insulated with a Dry-Zero 5 inch blanket. Keep the mercury down, burn less ice! The most efficient truck insulant know. This unique 1933 old dairy industry magazine advertisement would display wonderful matted and framed. Nice graphics.