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 5985-00-892-0758
NSN 5999-01-386-4008
NSN 6645-01-481-9834
NSN 5915-01-463-2090
NSN 6135-00-840-6451
NSN 5910-01-049-1271
NSN 6220-01-624-2825
NSN 5965-01-379-7706
NSN 6110-00-477-2299
NSN 5935-00-156-3697
NSN 5835-01-100-3265
NSN 6650-01-581-3614