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 6220-01-651-6506
NSN 5935-01-425-1373
NSN 6105-00-168-8638
NSN 5910-01-070-3671
NSN 5920-01-396-6159
NSN 5855-01-633-7796
NSN 6650-01-429-9242
NSN 6150-01-210-0093
NSN 5835-01-561-2959
NSN 6320-00-937-5625
NSN 5945-01-007-6808
NSN 6620-01-471-4360