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 5835-01-249-0275
NSN 6650-00-578-6543
NSN 5925-01-283-4414
NSN 6145-01-070-0579
NSN 6650-01-046-3718
NSN 5965-01-616-2364
NSN 5990-01-364-8405
NSN 6150-01-170-5658
NSN 6150-01-580-1489
NSN 6240-01-623-3798
NSN 6610-01-474-6333
NSN 5935-01-289-1195