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 5915-01-627-1197
NSN 5930-00-011-5255
NSN 5920-00-827-1094
NSN 6135-00-826-4798
NSN 5930-01-294-2417
NSN 6685-01-085-5977
NSN 6105-01-353-9763
NSN 5855-01-066-2882
NSN 5998-00-187-0515
NSN 5835-00-876-4544
NSN 6110-00-456-2058
NSN 5990-01-254-2936