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 5920-00-525-7406
NSN 6620-01-222-8820
NSN 6620-00-849-0110
NSN 6130-01-386-4823
NSN 6650-01-347-2291
NSN 4140-00-086-3814
NSN 6130-01-205-2640
NSN 6650-00-552-8377
NSN 5945-01-355-3743
NSN 2925-00-896-3752
NSN 5935-01-496-1089
NSN 6620-01-364-2103