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 5910-01-576-4001
NSN 4140-01-226-3314
NSN 6150-00-300-0395
NSN 5835-00-419-6576
NSN 5960-01-124-7011
NSN 5920-01-309-0429
NSN 6220-01-227-8811
NSN 5999-01-596-5424
NSN 6620-01-108-9181
NSN 5998-01-438-1737
NSN 5910-00-070-1575
NSN 6645-00-634-9317