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 5835-01-426-6573
NSN 5950-01-274-8938
NSN 6150-01-453-1650
NSN 6685-01-539-4207
NSN 6110-01-441-3422
NSN 5895-00-110-7179
NSN 5855-00-862-3345
NSN 6135-00-715-4001
NSN 6645-01-037-7725
NSN 5985-00-647-1163
NSN 5965-01-630-5956
NSN 6650-01-492-3399