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 6105-01-418-1877
NSN 5910-01-275-2594
NSN 6145-00-960-7318
NSN 5960-01-373-7317
NSN 6110-01-200-8237
NSN 6320-01-271-0247
NSN 5996-00-478-9159
NSN 5925-00-983-5666
NSN 5925-00-133-2963
NSN 6650-00-945-3098
NSN 6110-01-055-6442
NSN 5920-01-383-5594