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 6645-00-149-1100
NSN 5999-01-139-3958
NSN 2925-01-609-0417
NSN 5950-01-069-4498
NSN 4140-01-230-8468
NSN 5895-00-945-2528
NSN 6645-00-163-9580
NSN 6150-01-140-0027
NSN 5855-01-406-7237
NSN 6620-00-058-1533
NSN 5925-01-333-2419
NSN 5945-01-506-7270