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 5935-01-451-9005
NSN 5999-01-238-0475
NSN 6650-01-201-2956
NSN 5835-00-834-1286
NSN 5990-01-576-4383
NSN 5996-00-851-2604
NSN 5990-00-226-7894
NSN 5975-01-415-2357
NSN 5835-01-063-6284
NSN 5935-00-911-9875
NSN 6650-01-633-9147
NSN 6645-01-200-5289