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 5930-00-133-0181
NSN 6620-00-814-4770
NSN 6685-00-358-6250
NSN 5895-00-153-2595
NSN 6130-01-467-2561
NSN 5915-00-935-4984
NSN 5935-01-285-8755
NSN 6320-01-506-9439
NSN 5855-01-510-9416
NSN 5930-01-259-9587
NSN 5835-01-552-3153
NSN 6320-00-445-1187