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 5905-01-659-6962
NSN 5996-01-460-5189
NSN 5930-00-851-9957
NSN 5895-01-072-8177
NSN 5895-01-467-2513
NSN 5965-01-431-8147
NSN 6610-01-318-6713
NSN 5930-00-203-5594
NSN 7035-00-803-3056
NSN 7035-01-019-3951
NSN 5920-01-556-7297
NSN 6130-01-072-9999