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 5965-01-318-9474
NSN 6130-00-935-2712
NSN 7035-01-378-5074
NSN 6110-01-041-0854
NSN 5945-00-443-0003
NSN 4140-01-579-9513
NSN 2925-00-908-7702
NSN 5920-00-479-5254
NSN 5905-00-642-0173
NSN 5930-01-099-8404
NSN 6685-01-441-9378
NSN 5990-01-465-9235