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 6110-01-575-3077
NSN 5905-01-605-1569
NSN 6145-01-353-6211
NSN 6130-01-653-8132
NSN 5835-00-135-0375
NSN 5925-01-098-7829
NSN 5895-01-571-4278
NSN 6220-01-368-3119
NSN 5996-01-475-0406
NSN 5965-01-384-4912
NSN 6110-01-310-8476
NSN 6145-00-006-4954