Original oil and gas trade magazine vintage ad for CHICAGO PNEUMATIC TOOL COMPANY. Massive Appetite Drill Bit for Hard Shale. EM-1 tugged three cone bit has long teeth for penetrating speeds never before possible. Complete line includes Type ES-1, ES-2, ES-3, EM-2, EM-3, and Type EH-1 for exceedingly hard, abrasive formations. This unique 1953 old oilfield petroleum drilling equipment magazine advertisement would display beautifully matted and framed.