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 5975-00-900-0438
NSN 5990-01-303-0564
NSN 5930-00-767-2378
NSN 6150-01-142-8356
NSN 5935-01-445-4234
NSN 6620-01-386-5914
NSN 5930-01-068-3641
NSN 6135-01-633-8502
NSN 5999-01-597-4371
NSN 6620-00-104-6937
NSN 5925-01-447-1638
NSN 5975-00-826-1730