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 5925-00-053-3536
NSN 5960-00-078-9500
NSN 5855-00-014-5008
NSN 5935-01-403-2844
NSN 5895-01-659-6082
NSN 4140-00-542-4611
NSN 4140-01-502-6496
NSN 6650-00-052-3202
NSN 6135-01-041-3829
NSN 6150-01-451-9627
NSN 5895-00-648-9549
NSN 6145-00-322-0434