Original vintage mining magazine ad for DE LAVAL STEAM TURBINE COMPANY of Trenton, NJ. Submit Your Pumping conditions and Place Your Order Early. Pictured is a Single stage mine pump, capacity 250 gal per min against 40 ft head at 1,750 rpm and De Laval single stage pump in a coal mine delivering 400 gal per minute against 40 ft. head. De Laval Steam Turbine Co., Trenton, NJ. Dravo Doyle Company, Pittsburgh, Cleveland, and Philadelphia; Burford Hall & Smith, Atlanta, Turbine Equipment Co., New York City, Salt Lake Hardware Co., Salt Lake City, De Laval Steam Turbine Co. Chicago & San Francisco. Old 1928 mining equipment advertisement. Would look fantastic matted and framed.