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 5920-01-156-6293
NSN 5965-00-928-6983
NSN 6130-00-580-3725
NSN 5985-00-276-5368
NSN 5855-01-580-0645
NSN 6650-00-927-3391
NSN 6135-01-502-5787
NSN 6240-01-356-6911
NSN 6620-00-233-6839
NSN 6240-00-583-9863
NSN 6620-01-438-8479
NSN 5960-01-378-1729