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 5835-01-177-1092
NSN 5990-00-781-9423
NSN 6240-01-485-0008
NSN 5945-01-233-9246
NSN 6320-01-171-3238
NSN 6110-01-448-1736
NSN 5950-01-628-5958
NSN 5965-01-519-8758
NSN 6645-01-549-0935
NSN 5998-01-289-8150
NSN 5996-01-147-0697
NSN 6650-01-267-6522