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 6240-00-372-4841
NSN 5855-00-532-0025
NSN 5835-01-302-2745
NSN 5999-00-234-3531
NSN 5895-01-364-0889
NSN 6110-01-656-5838
NSN 4140-00-729-6098
NSN 5998-00-935-2510
NSN 5910-01-614-7064
NSN 5920-01-441-9363
NSN 6685-01-382-6767
NSN 5905-01-658-7356