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 5835-01-424-0054
NSN 5945-01-073-9241
NSN 5998-00-204-6452
NSN 6320-00-925-0558
NSN 6645-00-729-9900
NSN 5895-00-890-7023
NSN 5999-01-501-0694
NSN 5905-01-398-6865
NSN 5999-01-655-4326
NSN 6105-01-647-3320
NSN 6685-01-555-7938
NSN 6130-01-259-7115