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 2925-00-180-2532
NSN 5975-01-539-4536
NSN 6135-01-113-1507
NSN 5930-01-437-9081
NSN 5835-01-561-2959
NSN 6650-01-037-7637
NSN 5910-01-222-4356
NSN 5895-01-029-9535
NSN 6110-00-788-8865
NSN 6220-00-752-8479
NSN 6135-01-177-3552
NSN 5905-01-218-5967