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 5835-01-373-9506
NSN 5905-01-153-8131
NSN 5945-01-018-5963
NSN 6240-01-081-4122
NSN 5975-01-430-3701
NSN 5935-00-463-2653
NSN 5998-00-767-3587
NSN 7035-01-541-4216
NSN 6320-01-607-1491
NSN 2925-00-596-9775
NSN 6620-01-107-2965
NSN 5910-00-989-4373