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 5920-01-225-5442
NSN 6105-01-023-2773
NSN 5975-01-658-8225
NSN 6240-01-064-2980
NSN 7035-01-599-0015
NSN 6110-01-578-2010
NSN 5960-01-196-3018
NSN 6685-01-495-0654
NSN 5990-01-443-2931
NSN 6130-00-633-6187
NSN 5935-00-321-8317
NSN 5950-01-429-8741