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 5985-01-492-5943
NSN 5895-01-348-3950
NSN 5835-00-191-4793
NSN 6645-01-465-3235
NSN 5960-00-222-7772
NSN 4140-01-162-8967
NSN 5935-01-600-1320
NSN 5905-00-222-3784
NSN 6110-01-459-8859
NSN 6145-01-506-8222
NSN 6240-00-260-0399
NSN 6135-01-131-9352