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 6220-00-463-4812
NSN 6110-01-630-7321
NSN 6240-00-476-6916
NSN 6110-00-099-7113
NSN 7035-01-474-9537
NSN 2925-00-735-4979
NSN 5910-00-468-6300
NSN 5935-00-281-1237
NSN 6220-00-105-8968
NSN 5960-01-503-0362
NSN 4140-00-597-5260
NSN 5835-01-143-9143