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: Articles of plastics & articles of other materials of heading 3901 to 3914, nesoi
NSN 5990-01-599-7106
NSN 6150-01-196-4472
NSN 6240-00-467-7295
NSN 5905-00-371-0965
NSN 5835-00-484-1529
NSN 5905-01-193-5209
NSN 5945-01-546-8933
NSN 5910-00-889-9964
NSN 6220-00-628-4721
NSN 5925-00-622-2294
NSN 5920-01-139-5973
NSN 6145-01-143-1830