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 5985-00-153-8471
NSN 5925-01-573-2499
NSN 5930-01-335-6141
NSN 5999-01-304-7152
NSN 6130-01-512-1710
NSN 5996-01-030-8353
NSN 5935-01-517-5444
NSN 5960-01-270-3938
NSN 6110-01-157-5506
NSN 6110-01-368-1528
NSN 2925-01-437-1128
NSN 6645-01-180-6219