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 5975-01-576-6507
NSN 4140-01-424-0474
NSN 5935-00-922-3552
NSN 6320-01-540-4885
NSN 5985-01-554-5556
NSN 5905-01-249-4561
NSN 5920-00-794-4415
NSN 6150-01-608-5537
NSN 5996-00-272-2560
NSN 5990-00-573-6067
NSN 5985-01-468-7421
NSN 5855-01-548-5688