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 5985-01-550-5407
NSN 5996-01-315-6032
NSN 6620-01-270-4660
NSN 6610-01-422-2376
NSN 5920-00-030-5712
NSN 6110-01-049-8897
NSN 6130-01-491-0044
NSN 5996-01-072-4405
NSN 4140-01-589-7588
NSN 5930-01-515-9032
NSN 6620-00-703-0860
NSN 5920-00-063-0532