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 5835-00-113-6090
NSN 5925-01-496-2628
NSN 5910-00-927-2970
NSN 7035-01-129-4667
NSN 5999-00-333-2766
NSN 6620-01-132-7281
NSN 5910-01-447-2417
NSN 5895-00-023-2256
NSN 5835-00-339-3020
NSN 6240-01-361-9167
NSN 2925-01-267-1598
NSN 5990-01-384-2697