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 7035-01-010-4257
NSN 6610-01-428-3587
NSN 5960-01-550-8038
NSN 6240-01-584-5647
NSN 5960-01-364-1318
NSN 5985-01-420-7566
NSN 6650-01-092-0017
NSN 5960-01-381-2478
NSN 2925-01-462-1620
NSN 5905-00-938-2687
NSN 5930-01-382-9405
NSN 6650-01-416-0473