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 5960-00-024-0633
NSN 6150-01-183-3134
NSN 6645-00-445-8143
NSN 5985-01-206-7511
NSN 5835-00-170-5238
NSN 5905-01-521-4663
NSN 4140-00-186-3062
NSN 6135-00-715-4001
NSN 6150-01-627-3099
NSN 6150-01-653-4706
NSN 5975-01-383-7008
NSN 6320-01-495-1244