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 5835-00-001-5456
NSN 5935-00-843-0408
NSN 5965-00-950-0602
NSN 6110-01-524-5073
NSN 5965-01-429-0881
NSN 6150-00-061-3106
NSN 5905-00-673-3249
NSN 2925-00-056-7112
NSN 5920-01-192-7975
NSN 5998-00-481-1533
NSN 2925-01-251-7386
NSN 6130-01-650-2382