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 5975-01-256-2562
NSN 5945-01-400-5928
NSN 5915-01-325-5376
NSN 6135-01-415-1163
NSN 2925-01-106-3552
NSN 5990-01-542-4212
NSN 6145-01-634-0388
NSN 6110-01-289-7289
NSN 6135-01-391-6515
NSN 6620-01-039-5468
NSN 6135-01-056-4609
NSN 5855-01-554-3303