A transparent item of a predetermined size that permits unobstructed and undistorted view of a desired area. It may include a frame, have reference markings, grid lines and may be heat strengthened and/or tinted. It is generally used where safety, security, and/or the restriction of foreign matter are required, such as the visual examination of the inside of pressurized tanks, liquid sights, controlled liquid flow, and inspection of equipment enclosed in a housing. See window (as modified); scale, cathode ray tube; scale, plotting; window, metal; window, wood; and window panel, aircraft.
Classification: Pressed or molded glass articles, wired or not, for building or construction;leaded glass windows etc; formed multicellular or foam glass
NSN 5835-01-628-1748
NSN 5835-01-200-7153
NSN 5925-01-487-6456
NSN 5910-01-520-4992
NSN 5998-01-237-4633
NSN 6240-00-914-1669
NSN 5920-01-556-0912
NSN 5855-00-185-1560
NSN 5960-01-098-8437
NSN 5855-01-495-6457
NSN 5920-00-895-3270
NSN 5990-01-044-4767