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 6220-01-367-5064
NSN 6620-00-266-2763
NSN 5915-00-730-5944
NSN 5915-01-609-8605
NSN 6135-00-444-1402
NSN 6135-01-205-5965
NSN 5855-00-149-0766
NSN 5950-01-546-3864
NSN 5945-00-451-1974
NSN 5930-01-400-6126
NSN 5960-01-343-5912
NSN 5895-01-218-5745