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 6150-01-065-2358
NSN 6105-00-219-2925
NSN 5855-01-513-9601
NSN 6130-01-042-2286
NSN 5950-01-643-2126
NSN 6645-01-502-3068
NSN 4140-01-415-7988
NSN 5960-00-030-5485
NSN 6150-00-651-4079
NSN 5998-00-068-7678
NSN 5835-01-229-6964
NSN 5999-00-955-4138