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 5935-01-192-9097
NSN 5985-00-863-0450
NSN 5999-01-602-1395
NSN 5905-01-068-7892
NSN 6105-01-247-7013
NSN 6645-01-073-5302
NSN 5996-01-041-7555
NSN 6240-01-401-5340
NSN 6145-00-060-2818
NSN 6130-00-891-8800
NSN 5925-01-013-4432
NSN 6220-01-607-4046