Original oil and gas trade magazine vintage ad for SIVYER STEEL CASTING COMPANY, was located in Milwaukee, WI and Chicago, IL. Control. Balanced Metallurgical Control for Better Refining Castings. Horseshoe Top, Mule Ear Top, Screw Plug, Safety Mule Ear Top. This unique 1951 old petroleum refining industry equipment advertisement would look fantastic matted and framed. Approximate size 9 x 12 inches. Negro, African.