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 5985-00-411-3446
NSN 5960-01-138-3337
NSN 4140-01-387-0331
NSN 6135-01-578-8919
NSN 6130-01-417-2662
NSN 5965-01-323-0501
NSN 2925-01-299-6967
NSN 6610-01-344-0972
NSN 5999-00-904-4210
NSN 5935-01-547-7055
NSN 5915-01-616-6878
NSN 6130-01-513-1503