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 6150-01-565-4918
NSN 6150-00-840-5847
NSN 6645-01-010-3746
NSN 6685-01-280-0225
NSN 5835-00-614-0650
NSN 5945-01-247-3894
NSN 6620-00-221-7526
NSN 5945-01-414-8720
NSN 6645-01-426-8621
NSN 6610-00-906-3047
NSN 5935-01-305-7605
NSN 5910-00-823-6310