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[[image]] WHEREVER FLUSH-HEAD SCREWS ARE USED LOCKHEED adopts "Laminar Flow" [[image]] National HEADED AND THREADED PRODUCTS On exposed surfaces of fast planes, ordinary screws cause turbulence in air flow-and cut down speed. For the Lockheed Shooting Star, the trimmest and smoothest plane yet produced, "National" engineers developed true flush-head screws which have been adopted as standard by this great aircraft manufacturer. The special method which we devised for producing Laminar Flow Screws and holding them to the extremely close tolerances required is typical of National Technical Service. Please consult us about this or any other fastener subject. National Screw produces the most complete line of fasteners, both standard and special, made by any manufacturer for aircraft and other purposes. "National" specialties include the following: Phillips Recessed Screws Laminar Flow Screws Marsden Lock Nuts Dynamic Lock Nuts Drake Lock Nuts Place Bolts Lok-Thred Studs Rosan Locking System Scrivets Hi-Shear Rivets Sems Clutch Head Screws THE NATIONAL SCREW & MFG. CO., CLEVELAND 4,0. 1946 NATIONAL AIR RACES 55