[AVIATION]. Hispano-Suiza Aeronautical Engines Birkigt Patents Instruction Book July, 1918 Series No. 4A. New Brunswick: Wright-Martin Aircraft Corporation, 1918. 8vo. Illustrated with portraits of French World War I flying aces, as well as 11 fold-out blueprints and diagrams. Publisher?s full black cloth, front board elaborately stamped in gilt (binding somewhat edgeworn, a few gutters over-opened, skewed, a few tears to fold-out diagrams). A rare instruction manual for maintenance and repair for the Hispano-Suiza A-I-E engine.