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 5920-00-189-0858
NSN 7035-00-908-4933
NSN 5960-00-617-4449
NSN 5920-00-498-9442
NSN 5835-00-779-2836
NSN 5915-01-515-0156
NSN 5985-01-591-8287
NSN 5920-01-503-6448
NSN 6650-00-497-7913
NSN 5935-01-495-1125
NSN 5910-01-160-9278
NSN 6105-01-570-0351