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AMERICAN MARINE EXPOSITION 411 is the COEN COMPANY SWING DESIGN NATURAL DRAFT FIRING FRONT for installation under Water Tube Boilers. This type of Oil Burning Front is giving operators more than 80% BOILER EFFICIENCY over a wide load range, without chang- ing burner tips. Write us for Bulletin “M” Why not ask our engineers if you can burn oil economically. No obligation, simply write us. Coen Company, Inc. New York—50 Church St. San Francisco—112 Market St. Please mention MARINE REVIEW when writing to Advertisers