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 4140-01-297-0522
NSN 5910-01-257-2962
NSN 5930-01-265-0231
NSN 6320-00-456-0836
NSN 5930-00-848-2279
NSN 5855-01-052-7149
NSN 5925-01-634-0664
NSN 5998-01-441-1743
NSN 6620-01-104-5758
NSN 5855-00-149-0766
NSN 6650-01-555-8819
NSN 5965-01-528-8152