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 6110-01-174-3741
NSN 5999-01-397-2176
NSN 5985-01-532-4547
NSN 5835-01-581-6952
NSN 5945-01-414-9130
NSN 5965-00-823-8623
NSN 6145-00-815-9523
NSN 6685-01-026-0111
NSN 5935-00-825-8202
NSN 6240-01-571-7706
NSN 6110-01-353-5815
NSN 6240-00-726-4547