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 5905-01-068-4582
NSN 5965-01-205-6249
NSN 6150-00-636-8938
NSN 5895-01-490-7447
NSN 6650-01-595-6102
NSN 5999-01-597-3622
NSN 5905-01-296-2166
NSN 5905-01-026-4049
NSN 5945-00-190-8006
NSN 6220-01-075-5884
NSN 5950-01-386-0085
NSN 7035-00-541-8516