The aperture card is a type of punched card with a cut-out window into which a chip of microfilm or photo/negative is mounted. Such a card is used for archiving or for making multiple inexpensive copies of a document for ease of distribution.
North American Aviation (NAA) was a major American aerospace manufacturer, responsible for a number of historic aircraft, including the T-6 Texan trainer, the P-51 Mustang fighter, the B-25 Mitchell bomber, the F-86 Sabre jet fighter, the X-15 rocket plane, and the XB-70, as well as Apollo command and service module, the second stage of the Saturn V rocket, the Space Shuttle orbiter and the B-1 Lancer. Through a series of mergers and sales, North American Aviation became part of North American Rockwell, which later became Rockwell International and is now part of Boeing.
Film was obtained from the estate of a former North American Aviation - Rockwell employee who worked in the Photography Department. Card is 7-1/2" x 3-1/4" on an IBM L36593 Aperture Card, with a 1-3/4" x 1-1/4"photo/image window.