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 6110-01-537-6669
NSN 5999-01-149-6517
NSN 6320-01-519-8767
NSN 5915-01-053-1968
NSN 5996-00-081-2564
NSN 5990-01-100-1840
NSN 6105-00-665-8581
NSN 6645-01-384-7791
NSN 5920-00-992-1820
NSN 5990-01-411-5930
NSN 6645-01-437-9017
NSN 5855-01-203-4719