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 5935-01-555-8032
NSN 6130-01-269-5938
NSN 6150-01-016-5602
NSN 6220-00-264-9473
NSN 5990-01-292-6000
NSN 5905-00-972-4740
NSN 5945-01-025-9810
NSN 6240-01-388-1739
NSN 5975-01-413-6677
NSN 5905-01-073-7587
NSN 5960-01-013-9346
NSN 6110-01-507-6170