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 6135-01-417-6539
NSN 5920-01-416-0616
NSN 6240-00-705-7731
NSN 5996-00-875-6818
NSN 5930-01-495-5571
NSN 2925-01-385-6661
NSN 5945-01-501-5487
NSN 5998-00-189-0761
NSN 6650-00-641-6139
NSN 6650-01-493-9173
NSN 5990-01-604-0862
NSN 5996-01-444-4547