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 5996-01-498-0653
NSN 5965-01-069-0391
NSN 5999-01-552-3274
NSN 5935-01-353-1484
NSN 5996-01-452-1868
NSN 6105-01-312-3618
NSN 5930-01-551-3807
NSN 6150-00-088-1717
NSN 5950-00-840-6646
NSN 7035-01-550-6160
NSN 5835-01-566-5462
NSN 6110-01-284-5200