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 5985-01-517-3007
NSN 5960-01-100-5065
NSN 5960-01-530-0581
NSN 5996-01-100-4361
NSN 5960-01-478-9493
NSN 6320-01-624-0193
NSN 5905-01-412-0231
NSN 6220-00-907-1341
NSN 6240-01-358-9980
NSN 5835-00-021-2521
NSN 6220-01-034-1231
NSN 5905-01-435-3063