Elmhurst 73, New York: Kollsman Instrument Corporation circa 1960. First Edition. 24 pages. 8 1/2 x 11 inches. Pictorial wrappers, stapled. Scuffing to the covers, clean internally. Very Good. Wraps. 
A brochure highlighting various systems available from Kollsman related to missile and space systems. Based on some of the models and some internet searching our best guess is this is circa 1960. One two-page spread is on the MD-1 automatic astro compass system for use in B-52 aircraft. There are also US Navy submarine periscopic astrotrackers, commercial photoelectric sextants, star tracking systems, etc. While there are some excellent images of some of the equipment, but their very nature there are no specifications to be found. Not surprisingly, a scarce publication, with no copies in OCLC/Worldcat as of this writing.